Help please with the ESP and Brake Malfunction lights on my display

[jv_atc]

Dear Audi Fans,

I have a 2005 A6, 4.2L, Quattro, with ~117K miles

Several weeks ago, I noticed that my passenger floor was damp after a light rain... I pulled the carpet back and it was also damp underneath, yet no standing water. I let it dry for a week. I did some water testing and found water coming through a rubber sidewall plug near the front, right sunroof (bottom) drain. I went on to check the cowl (pendulum?) drain and one was nearly full of junk.

Several days later the ESP, Traction and Brake Malfunction lights all came on, as did my air bag light yet is has since remained off. This looks like a mess to me and may be beyond my ability, yet I will try. Could this just be a coincidence?

Anyone with experience with this issue or interpreting the scan below, I will be very grateful. Thank you.



Wednesday,04,September,2024,12:26:19:48210
VCDS -- Windows Based VAG/VAS Emulator Running on Windows 7 x64
VCDS Version: 24.7.0.0 (x64)
Data version: 20240715 DS356.3
www.Ross-Tech.com


VIN: WAUDL74F65N037903 License Plate:


Chassis Type: 4F (4F0)
Scan: 01 02 03 05 07 08 09 0E 0F 15 16 17 19 36 37 42 46 47 4F 52
53 55 56 61 62 67 72 76 77

VIN: WAUDL74F65N037903 Mileage: 188300km-117004miles

00-Steering Angle Sensor -- Status: OK 0000
01-Engine -- Status: Malfunction 0010
02-Auto Trans -- Status: OK 0000
03-ABS Brakes -- Status: Malfunction 0010
05-Acc/Start Auth. -- Status: OK 0000
07-Control Head -- Status: OK 0000
08-Auto HVAC -- Status: OK 0000
09-Cent. Elect. -- Status: OK 0000
0E-Media Player 1 -- Status: OK 0000
0F-Digital Radio -- Status: Malfunction 0010
15-Airbags -- Status: OK 0000
16-Steering wheel -- Status: OK 0000
17-Instruments -- Status: OK 0000
19-CAN Gateway -- Status: OK 0000
25-Immobilizer -- Status: OK 0000
36-Seat Mem. Drvr -- Status: OK 0000
37-Navigation -- Status: OK 0000
42-Door Elect, Driver -- Status: OK 0000
46-Central Conv. -- Status: Malfunction 0010
47-Sound System -- Status: OK 0000
4F-Centr. Electr. II -- Status: OK 0000
52-Door Elect, Pass. -- Status: OK 0000
53-Parking Brake -- Status: OK 0000
55-Headlight Range -- Status: OK 0000
56-Radio -- Status: OK 0000
61-Battery Regul. -- Status: OK 0000
62-Door, Rear Left -- Status: OK 0000
67-Voice Control -- Status: OK 0000
72-Door, Rear Right -- Status: OK 0000
76-Park Assist -- Status: OK 0000
77-Telephone -- Status: OK 0000

-------------------------------------------------------------------------------
Address 01: Engine Labels: Redir Fail!
Part No SW: 4F0 910 560 A HW: 4F0 907 559
Component: 4.2L V8/5V G 0010
Revision: -------- Serial number:
Coding: 0007772
Shop #: WSC 09550 758 80885
VCID: 204FD9DCF37FB196E3-8074
VINID: 9D19547071161857800C72400CBF5A91AB

1 Fault Found:
18061 - Please check DTC Memory of ABS Controller
P1653 - 008 -
Readiness: 0110 1101

-------------------------------------------------------------------------------
Address 02: Auto Trans Labels: 09L-927-760.lbl
Part No SW: 4F1 910 156 G HW: 09L 927 156
Component: AG6 09L 4.2L5V USA 0070
Revision: --H01--- Serial number: 0044539
Coding: 0001002
Shop #: WSC 02327 785 00200
VCID: 285FC1FC9B4F49D6AB-807C

No fault code found.

-------------------------------------------------------------------------------
Address 03: ABS Brakes Labels: 4F0-910-517.clb
Part No SW: 4F0 910 517 E HW: 4F0 614 517 A
Component: ESP8 quattro H03 0010
Revision: 00000000 Serial number: 00000000000000
Coding: 0004456
Shop #: WSC 02327 785 00200
VCID: 2643CFC4915B5FA699-8072

1 Fault Found:
00493 - ESP-Sensor Unit (G419)
004 - No Signal/Communication
Freeze Frame:
Fault Status: 01100100
Fault Priority: 2
Fault Frequency: 1
Reset counter: 72
Mileage: 188306 km
Time Indication: 0
Date: 2024.09.04
Time: 12:21:38

Freeze Frame:
Hex Value: 0x0280
Hex Value: 0x4082
Hex Value: 0x0000
Hex Value: 0x0091
Hex Value: 0x00FF


-------------------------------------------------------------------------------
Address 05: Acc/Start Auth. Labels: None
VCID: 55A1B808BCBD043EC0-FFFE

No Faults Found
or DTCs not supported by controller
or a communication error occurred

-------------------------------------------------------------------------------
Address 07: Control Head Labels: 4F0-910-7xx-07-H.clb
Part No SW: 4F0 910 732 Q HW: 4E0 035 729
Component: Interfacebox H43 4610
Revision: 00000000 Serial number: 360GI047502264
Coding: 0000003
Shop #: WSC 02335 785 00200
VCID: 31692C98A895081E7C-8064

Subsystem 1 - Part No: 4F0 910 609
Component: Bedienteil MMIC6H07 0870

Subsystem 2 - Serial number: 00000000040920

Subsystem 3 - Serial number: 0111.08.040000000100010226ÿ

Subsystem 4 - Serial number: 010226ÿ

No fault code found.

-------------------------------------------------------------------------------
Address 08: Auto HVAC Labels: 4F0-910-043.clb
Part No SW: 4F0 910 043 HW: 4F1 820 043 J
Component: KLIMABETAETIGUNGH11 0110
Revision: 00000023 Serial number: 00000000046229
Coding: 0000040
Shop #: WSC 02327 785 00200
VCID: 5BB5AE309A99D24EF6-800E

No fault code found.

-------------------------------------------------------------------------------
Address 09: Cent. Elect. Labels: 4F0-910-279.lbl
Part No SW: 4F0 910 279 AE HW: 4F0 907 279 A
Component: ILM Fahrer H32 0400
Revision: 00000000 Serial number: 4F0907279
Coding: 0102023
Shop #: WSC 00000 000 00000
VCID: 6CD7FDEC4F37A5F60F-8038

Subsystem 1 - Part No: 4F1 910 113 Labels: 1KX-955-119.CLB
Component: Wischer AudiC6 H05 0150
Coding: 00062736
Shop #: WSC 00000

No fault code found.

-------------------------------------------------------------------------------
Address 0E: Media Player 1 Labels: 4E0-910-111.lbl
Part No SW: 4E0 910 111 F HW: 4E0 035 111
Component: CD-Changer H44 0470
Revision: 00000000 Serial number: AUZ5ZBD4026098
Shop #: WSC 00000 000 00000
VCID: 1C37ED2CDF1795763F-8048

No fault code found.

-------------------------------------------------------------------------------
Address 0F: Digital Radio Labels: 4E0-910-593-SIR.lbl
Part No SW: 4E0 910 593 D HW: 4E0 035 593
Component: SDAR SIRIUS H04 0670
Revision: 00000000 Serial number: AUZ4Z7G0219562
Shop #: WSC 00000 000 00000
VCID: 285FC1FC9B4F49D6AB-807C

1 Fault Found:
02635 - Tuner Not Enabled/Activated
000 - -
Freeze Frame:
Fault Status: 01100000
Fault Priority: 7
Fault Frequency: 1
Reset counter: 72
Mileage: 188306 km
Time Indication: 0
Date: 2024.09.04
Time: 12:05:13


-------------------------------------------------------------------------------
Address 15: Airbags Labels: 4F0-910-655-8R.clb
Part No SW: 4F0 910 655 B HW: 4F0 959 655 A
Component: 46 AIRBAG AUDI8RH28 0310
Revision: 09H28000 Serial number: 00359D070B6B
Coding: 0013366
Shop #: WSC 22163 444 58758
VCID: 2643CFC4915B5FA699-8072

Subsystem 1 - Part No: 4F0 910 339
Component: BF-Gewichtsens. 002 0040

Subsystem 2 - Serial number: 6332CSME037648593

Subsystem 3 - Serial number: 6342CSME03127952Y

Subsystem 4 - Serial number: 6351HSME03664F045

Subsystem 5 - Serial number: 6361HSME03594F6FP

Subsystem 6 - Serial number: 6371VSME031C00649

Subsystem 7 - Serial number: 6381VSME031C4809L

No fault code found.

-------------------------------------------------------------------------------
Address 16: Steering wheel Labels: 4F0-910-549.lbl
Part No SW: 4F0 910 549 HW: 4F0 953 549 B
Component: Lenksäulenmodul H07 0230
Revision: 00H07000 Serial number: 90022042160019
Coding: 0012241
Shop #: WSC 02323 785 00200
VCID: 66C38FC451DB9FA659-8032

Subsystem 1 - Part No: XXXXXXXXXXX
Component: Lenkradmodul H05 0080

No fault code found.

-------------------------------------------------------------------------------
Address 17: Instruments Labels: 4F0-920-KOM-V1.clb
Part No SW: 4F0 910 900 A HW: 4F0 920 950 M
Component: KOMBIINSTR. M73 H08 0460
Revision: 00200000 Serial number: 4I250A384
Coding: 0065203
Shop #: WSC 45478 001 104857
VCID: 1E33E724C90B8766D1-804A

No fault code found.

-------------------------------------------------------------------------------
Address 19: CAN Gateway Labels:. 4F0-910-468.clb
Part No SW: 4F0 910 468 A HW: 4F0 907 468 B
Component: Gateway H09 0030
Revision: 09 Serial number: 080080472602E0
Coding: ECFE73CC1B7904
Shop #: WSC 23011 444 84441
VCID: 275DC2C0965146AEA2-8072

No fault code found.

-------------------------------------------------------------------------------
Address 36: Seat Mem. Drvr Labels: None
Part No SW: 4F0 910 760 HW: 4F0 959 760
Component: Sitzmemory FS H04 0050
Revision: 00000000 Serial number: 00000000896400
Coding: 0082946
Shop #: WSC 02327 785 00200
VCID: 61C99CD8B8F5F89EAC-8034

No fault code found.

-------------------------------------------------------------------------------
Address 37: Navigation Labels: 4E0-910-88x-37.lbl
Part No SW: 4E0 910 888 M HW: 4E0 919 887 C
Component: MNS US H44 1100
Revision: 00000000 Serial number: 378B-057517919
Shop #: WSC 23011 444 57521
VCID: 387F11BC4BEFD9563B-806C

No fault code found.

-------------------------------------------------------------------------------
Address 42: Door Elect, Driver Labels: 4F0-910-793-42.lbl
Part No SW: 4F0 910 793 B HW: 4F0 959 793 B
Component: TSG FA H10 0020
Revision: 00000000 Serial number: a•#
Coding: 0035691
Shop #: WSC 02327 785 00200
VCID: 2959C4F8804570DEB4-807C

No fault code found.

-------------------------------------------------------------------------------
Address 46: Central Conv. Labels:. 4F0-910-289.lbl
Part No SW: 4F0 910 289 E HW: 4F0 907 289 E
Component: Komfortgeraet H14 0090
Revision: 00900014 Serial number: 01000543210000
Coding: 0423997
Shop #: WSC 02335 785 00200
VCID: 2C573DEC8FB765F64F-8078

Subsystem 1 - Part No: 1K0 951 605 A
Component: LIN BACKUP HORN H01 1201

1 Fault Found:
01134 - Alarm Horn (H12)
012 - Electrical Fault in Circuit
Freeze Frame:
Fault Status: 01101100
Fault Priority: 3
Fault Frequency: 254
Reset counter: 72
Mileage: 180055 km
Time Indication: 0
Date: 2019.08.12
Time: 08:51:35


-------------------------------------------------------------------------------
Address 47: Sound System Labels: 4F0-910-223-AS.lbl
Part No SW: 4F0 910 223 G HW: 4F0 035 223
Component: Amp.-ASK H09 0350
Revision: 14S00001 Serial number: 01907040022165
Coding: 0000016
Shop #: WSC 02335 785 00200
VCID: 224BD3D4FD73A386F5-8076

No fault code found.

-------------------------------------------------------------------------------
Address 4F: Centr. Electr. II Labels: 4F0-910-280.lbl
Part No SW: 4F0 910 280 HW: 4F0 907 280 A
Component: ILM Beifahrer H07 0040
Revision: Serial number: 00000000024766
Coding: 0011114
Shop #: WSC 02323 785 00200
VCID: 5EB3A724898BC76691-800A

No fault code found.

-------------------------------------------------------------------------------
Address 52: Door Elect, Pass. Labels: 4F0-910-793-52.lbl
Part No SW: 4F0 910 793 B HW: 4F0 959 792 B
Component: TSG BF H10 0020
Revision: 00000000 Serial number: ‚™#
Coding: 0035691
Shop #: WSC 02327 785 00200
VCID: 2959C4F8804570DEB4-807C

No fault code found.

-------------------------------------------------------------------------------
Address 53: Parking Brake Labels: 4F0-910-801.clb
Part No SW: 4F0 910 801 C HW: 4F0 907 801 A
Component: EPB CDEC0080 H04 0080
Revision: --H04---
Coding: 0006022
Shop #: WSC 23011 444 57521
VCID: 204FD9DCF37FB196E3-8074

No fault code found.

-------------------------------------------------------------------------------
Address 55: Headlight Range Labels: 4F0-910-357.lbl
Part No SW: 4F0 910 357 E HW: 4F0 907 357 E
Component: AFS 1 H01 0010
Revision: 00000001 Serial number:
Coding: 0000016
Shop #: WSC 22163 444 58758
VCID: 285FC1FC9B4F49D6AB-807C

Subsystem 1 - Part No: 4F0 941 329 A
Component: AFS-Modul links H05 0010

Subsystem 2 - Part No: 4F0 941 329 A
Component: AFS-Modul rechtsH05 0010

No fault code found.

-------------------------------------------------------------------------------
Address 56: Radio Labels: 4E0-910-541.lbl
Part No SW: 4E0 910 541 T HW: 4F0 035 541
Component: TUNER EU/US/RDW H41 0630
Revision: 00000000 Serial number: 352HS047550764
Coding: 0000002
Shop #: WSC 02327 785 00200
VCID: 31692C98A895081E7C-8064

No fault code found.

-------------------------------------------------------------------------------
Address 61: Battery Regul. Labels: 4F0-910-181.clb
Part No SW: 4F0 910 181 E HW: 4F0 915 181 A
Component: ENERGIEMANAGER H11 0400
Revision: 00000000 Serial number: 00000000040420
Shop #: WSC 26153 444 00583
VCID: 2345D6D0E269AA8EFE-8076

Subsystem 1 - Part No: 4F0 915 105 D
Component: von VA0 1408090073
Coding: 344630393135313035442056413031343038303930303733
Shop #: WSC 00000 640 00290

No fault code found.

-------------------------------------------------------------------------------
Address 62: Door, Rear Left Labels: 4F0-910-795.lbl
Part No SW: 4F0 910 795 HW: 4F0 959 795
Component: TSG HL H09 0010
Coding: 0035370
Shop #: WSC 02327 785 00200
VCID: 69D984F840C5B0DE74-803C

No fault code found.

-------------------------------------------------------------------------------
Address 67: Voice Control Labels: 4E0-910-75x-67.lbl
Part No SW: 4E0 910 754 Q HW: 4E0 035 753 A
Component: SDS 3501 US H45 0630
Revision: 00000000 Serial number: 00000407260196
Shop #: WSC 12336 024 394758
VCID: 3467258C57873D3617-8060

No fault code found.

-------------------------------------------------------------------------------
Address 72: Door, Rear Right Labels: 4F0-910-795.lbl
Part No SW: 4F0 910 795 HW: 4F0 959 794
Component: TSG HR H09 0010
Coding: 0035370
Shop #: WSC 02327 785 00200
VCID: 69D984F840C5B0DE74-803C

No fault code found.

-------------------------------------------------------------------------------
Address 76: Park Assist Labels: 4Fx-910-283.lbl
Part No SW: 4F0 910 283 HW: 4F0 919 283
Component: Parkhilfe 4-Kan H09 0020
Revision: --.--.-- Serial number: 11730420500316
Coding: 0001206
Shop #: WSC 131071 1023 2097151
VCID: 61C99CD8B8F5F89EAC-8034

No fault code found.

-------------------------------------------------------------------------------
Address 77: Telephone Labels: 4E0-910-336.lbl
Part No SW: 4F0 910 336 H HW: 4E0 862 335
Component: Handyvorb2 H10 1130
Revision: 00000000 Serial number: 00000007500532
Coding: 0010900
Shop #: WSC 00000 000 00000
VCID: 285FC1FC9B4F49D6AB-807C

No fault code found.

End-------------------------(Elapsed Time: 06:25)--------------------------

[Avantly]

Very interesting. Your yaw sensor (G419) isn't communicating. The sensor communicates via CAN, it should be located in the center of the car right on top of the driveshaft tunnel, in a spot that is approximately underneath the center console armrest. You might be able to reach it from the back of the console without removing it, I am not sure.

I have never had one of these fail but I do know they are sensitive to shock and can be destroyed by dropping them on a hard surface. It seems that if it was damaged in such a way, it would still communicate and simply would not measure yaw correctly or at all; Therefore it sounds like this sensor has either completely failed, or you have a problem with the power or ground feed. It should have four wires - Power, ground, CAN high and CAN low. I would check the power and ground before deciding to replace the sensor since you mentioned having water on the floor. I don't have my service laptop in front of me but I can check and see if there are any splices in the ground or power feed under the carpet as these points would be suspect if there were any issues with power or ground.

I wouldn't be afraid to replace this sensor with a used one, I have never had one fail in any of my C6 (nor my C5 for that matter) so I suspect that they are generally quite reliable.

To test the power and ground feed, I'd definitely want to sink a bit of current into the ground wire/source a bit from the power. Do you have a multimeter?

[jv_atc]

Thank you,

I do have a multimeter and will try and figure out ground and power. Are the CAN pins in need of some kind of testing? Is there a way to test the G419? I did locate the G419 via online searches and could see that it is possible to remove from the rear of the console.

I pulled the carpet as far back as I could and could only see harness. I did notice a new ground wire, after the dealer replaced the passenger airbag, that is when all of this started.

How can you tell that the G419 is not communicating with other modules and not the other way around?

BTW - You may been on the right all along.

[Avantly]

The reason I assume that the communication error is on the G419 side is because it communicates via CAN with the ABS/ESP system, and the ABS module is the only module noting that there is a problem (and the ECU is also telling you to check the ABS computer because it is not happy).

I will have to look at the wiring diagrams, but I would assume there is more than just the G419 sensor on that particular CAN bus; As long as this is true, then if something was wrong with the CAN bus, then you would have more codes for the other devices on that bus. As long as there are more devices on that CAN bus, then it probably isn't necessary to test the bus since you know the other modules are happy and therefore the CAN bus is most likely OK. You could measure the voltages on the CAN bus (should be between ~2 and ~4V) but further testing would require a more advanced tool.

I don't think there is any easy way to test the G419, you would need a CAN master or something similar to test it on the bench and I am not sure that the messages for this sensor are well documented anywhere.

For testing power and ground, keep in mind that if you have a wire somewhere that is corroded, but not completely broken, a multimeter may show acceptable measurements when in fact there is a problem - This is because the impedance of the multimeter is very high, therefore it places hardly any load on these power wires. Something like a test light with a filament bulb, a brake light bulb, etc should be used to place a load between power and ground; When this load is applied to the pins, you connect one side of the multimeter to a known good ground, and then measure the voltage on both the ground pin and 12V pin. With a load applied, both pins should be very close to the same voltage measured when there is no load applied.

You have a first model year C6, these cars are reaching that 2 decade point, so it is conceivable that the sensor just quit... If it appears to be the sensor, and you have a junkyard nearby, you could buy a cheap replacement and just plug it in - If there is no wiring problem, then your no communication code would go away and you would have the standard code regarding calibration needed of the steering angle/yaw with a simple drive cycle. I took a quick look on ebay and these sensors are quite cheap at $30-40 there so maybe even cheaper at a local junkyard. I wouldn't be afraid of buying a used yaw sensor (as long as it hadn't been dropped lol) since the current dealer price on this sensor appears to be over a thousand dollars!

[jv_atc]

Wow, okay, that makes sense, also that the ABS module is giving off some sort of signal, so look at the other components. Thank you for the tips on testing. This helps me understand the issue much better. I've got 2 on my eBay watch list and may order tomorrow, depending what I can figure out. I saw the MSRP price, crazy.

Will a used sensor (assuming that's all it is) require any kind of re-coding?

I tried to re-calibrate steering angle today yet the Ross Tech security code was rejected.

[Avantly]

I could be wrong, but I do not believe there is any coding for this sensor. IIRC with this generation of ABS/ESP there is also no more requirement to enter the login code for coding; The only requirement for coding is that the Air Bag module first has the correct(matching) driveline and brake system variant coding in it. You will not be able to do the steering angle calibration without this sensor working - And if memory serves me correct, this generation of C6 should complete the steering angle calibration from a short drive cycle (with turning the steering wheel to the locks in both directions) and clear the angle sensor calibration trouble code on its own.

This particular yaw sensor is called an "ESP Duosensor" by VAG, and it measures on two planes instead of one. The first plane is the typical yaw sensor plane, side to side rotation of the vehicle. I can't remember what the second plane is offhand but it is probably sideways roll of the vehicle. This data is used by the ABS program, ESP program, and Air Bag system hence why you get all of the lights. I believe the data might also be used for the servotronic steering control?

I just checked wiring diagram and it appears that this sensor may be communicating with the ABS/ESP module on a dedicated high-speed CAN bus with nothing else on that bus. Therefore I would actually check the voltages on the CAN bus to make sure that they are within the expected range. I highly doubt there are any splices in this CAN bus between the sensor and the ABS/ESP module to fail, but I will try to check that this afternoon.

[jv_atc]

Below is what I came up with today. I am not experience in electronics and there may be errors. I was able to disconnect the sensor yet I doubt I'll be able to pull it without removing the center console.

4 – wire plug
With power Wire color Without power
2.7V Orange/brown 1.3 KΩ
12V Black/purple 17.9 KΩ -Power?
14.4 KΩ Brown 0.44 KΩ -Ground?
2.7V Orange/black 1.3 KΩ

[Avantly]

How are you measuring the voltages for the power and ground wire? Did you mean 14.4V for the 3rd line, not 14.4Ohm?

For power, measure voltage between brown and Black/Purple, and also measure between (known good ground - Maybe a clean spot on lower seat bracket, or the metal perimeter of cigarette lighter) and Black/Purple
For ground, measure voltage between Brown and (known good ground), but for resistance, do this first: Short your multimeter leads together at the tips, and press the "REL" button on your multimeter (or however it activates relative meausurement mode). This will cancel out the resistance of the leads themselves + any internal resistance in the DMM, which I suspect is at least 0.2-0.4 ohms. I am not sure where you got the 0.44kOhm measurement on ground, please let me know how that was measured. Even without Relative mode activated on the DMM, if you measure resistance between some known good ground in the car, and the brown ground wire pin, I would expect the measurement to be under 1 ohm.

Please let me know if any of the above doesn't quite make sense, I can draw up a quick diagram which will make more sense - It is often difficult to adequately describe desired measurement points/methods without a diagram.

Oh, and BTW, CAN voltages look good, so that is good news.

[jv_atc]

LOL, as you will see, I am a novice. I reviewed you notes and re-checked values 3 times. See below.

Initially, I grounded (to a known ground) then probed each terminal for resistance and power, with and without power. I couldn't figure out how to turn my new DMM off from Auto, so it kept reading resistance instead of volts. I grabbed a cheap MM to get another resistance value.

Brown to Black/Purple = 11.95v
Black/Purple to known ground = 11.95v

Resistance
Brown to known ground = 1.51 (Kohms) on one DMM and 015 on the other MM

It looks like I have power and ground as it should. Would it be safe to say, its the sensor?

I took my chances and went to the wrecking yard today and pulled one from a newer model A4.

My original part number - 4F0907637. From what I have gathered online Part Number: 6Q0907637A
Supersession(s): 4F0907637; 6Q0-907-637-A

I then re-scanned and went from 'no signal' to 'implausible signal' at the sensor and then back to 'no signal'. I'm not positive if this is a result of the 'sensor' needing re-coded or it simply won't work. I doubt that I will be able to find one at a local yard as the application is limited to a few cars between 05 and 08. Looking on eBay.

[Avantly]

LOL, as you will see, I am a novice. I reviewed you notes and re-checked values 3 times. See below.

Initially, I grounded (to a known ground) then probed each terminal for resistance and power, with and without power. I couldn't figure out how to turn my new DMM off from Auto, so it kept reading resistance instead of volts. I grabbed a cheap MM to get another resistance value.

Brown to Black/Purple = 11.95v
Black/Purple to known ground = 11.95v

Resistance
Brown to known ground = 1.51 (Kohms) on one DMM and 015 on the other MM

It looks like I have power and ground as it should. Would it be safe to say, its the sensor?

Brown to known ground being 1.51kOhms is definitely not right, but not sure what 015 means on the other one? Do you know what range it was in when it said 015? I would not expect it to read more than 1 ohm even on a meter with really crappy leads. So I am still not quite sure what your meter is saying. If measuring between the brown wire, and a known good ground is *definitely* 1.51kOhms, then we have found your problem, but I'm wondering if maybe your meter is having trouble with auto ranging.

Do you have a test light that uses a bulb, and not an LED? I think they still sell them at harbor freight. The LED ones don't use enough power to be relevant IMO, it really needs to be a filament bulb since that filament bulb takes quite a bit more power than the LED which is beneficial for this test. To test with a test light, you would connect one end of the test light to brown and the other to black/purple, and the light should light up.

Alternatively, if you do not have a test light, do you have a cigarette lighter phone charger? This might seem janky but you could rig up some paperclips bent straight with some tape to connect the center pin of the charger to black/purple, and the side lugs of the charger to brown. With your phone plugged in to the charger, touch the two paperclip wires to those pins (don't reverse them, cheap USB chargers may not have reverse voltage protection in which case USB charger will become a paperweight), if your phone starts charging (and stays charging after a few seconds) then the power feed is definitely good since that charger should be pulling upwards of half an amp from those wires. No worries about blowing a fuse as half an amp will be well within the capability of the wires, that circuit should have at least a 5 amp fuse on it.

[jv_atc]

Just edited my post above. I do have a filament test light yet can't find it. I may just go buy one, or borrow one. I also have 2 other DMM's but again don't know where they are. I moved to my hometown with a moving truck ready to unload, arrived at my house to a massive flood inside the house. Most of what I own is in boxes, in the garage. I do not know the range on the second MM, no denotations of value. I will get back to this tomorrow.

I think it is my DMM's; one reports in Kilo Ohms, and the other will not go below the 200 Ohms setting. Looking for an alternate.

I think that I was using a bad ground source.

Update of Brown to (verified) good ground.
DMM1 = 1.1
DMM2 = .89

[Avantly]

Ok, so that probably looks good for the ground. Of that 0.89 ohms, I wouldn't be surprised if 0.8 ohms was just the resistance of the leads and any oxidation on the surface of the leads and terminal. I just checked a brand new set of high end pomona test leads on my fluke DMM and the total resistance of those leads is 0.45Ohm... I have seen really low quality china leads from Amazon well above 1 ohm.

I see you edited your comment right after my last post, I missed the comment about the junkyard sensor.

Going from no signal to implausible signal does not make sense to me for a CAN based sensor... Except... Was the sensor bolted horizontally on the car when you plugged it in and tested it? Keep in mind that this is a 2 axis sensor which, when the car is off/not in motion should show virtually no rotation on either axis... If you just had it sitting on the carpet or free hanging I suspect this would explain an implausible signal code. Very odd that it went back to no signal. Maybe still a good idea to test the power feed with a test light.

Here is the G419 procedure from ELSAWin:
-Remove "extension" of center console
-Unplug electrical connector from G419 and remove two securing bolts
-Remove sensor and reinstall new sensor, making sure new sensor is seated in its bracket and is free of stress
-"DO NOT use the securing bolts to forcibly position the sensor unit G419" (i.e. make sure it is correctly seated before installing the bolts)
-Tighten securing bolts to 10Nm (Hand tight, not hoo-rah tight but give it a little finger love)

It does mention using the VAG VAS tool to select the "Replace" function for the sensor. I checked ODIS-S and I see absolutely nothing about any coding for this sensor under guided functions, the only thing I see is the steering angle calibration.

Since you saw the junkyard sensor go from no signal->implausible signal->no signal I am still wondering if there is a power feed issue. I looked at the wiring diagram. The 12V for this sensor *appears* to come directly from the ABS module with no splices.
The Ground connection leaves the sensor and goes into "main wiring harness". Inside "main wiring harness" is a ground splice for this module's ground, the splice does not appear to be shared so this must be a point where two sub-harnesses met up and they spliced them together. That splice is called "Earth connection 27" however I can not find any diagram showing where it is located in the harness, I would guess that it could be found if you followed the harness but this may be a pain with the carpet in the car. From there, the ground wire continues to the underside of the dash on the right side, where it bolts to what appears to be the metal dash frame (it appears that the stud it is fastened to is facing downward towards the floor, looks like it may be behind/above the glove box) or towards the rear underside of the dash).

So, you could try another sensor but I really think you should try to find that test light or devise another way to put a load on these power wires to make sure that they are OK...? Your DMM is showing what appears to be a low resistance to ground which is good, I just don't know why it would apparently toggle between no signal and implausible signal. Definitely check it with the sensor in the correct orientation and stationary just to make sure it wasn't simply the positioning of the sensor that caused this.

[jv_atc]

I didn't think about the dual axis. The sensor was not mounted properly (was not flat, which as you suggest, likely disrupting the axis), however the reason I believe that it didn't work was that it is the incorrect application. I did use a test light today as you recommended and found that the light illuminated on the Black/Purple wire. I will dig into "use the VAG tool to select the "Replace" function for the sensor". I will also see if I can re-calibrate the steering angle. There are 2 grounds in the area that you described, right, front, passenger floor, under the carpet.

I went to a different wrecking yard today and found the exact part, which had been sitting in the elements for over a year with no sunroof, yet it works!!! I ordered one from eBay last night that I will return in a few weeks if the used replacement works out.

After the install, I cleared codes, went for a drive as my E-Brake fault activates after about 5mph. I'll drive the car tomorrow to confirm the repair. Below is a post repair scan.

THANK TO AVANTLY FOR KICKING ASS! I believe that I learned a lot throughout this process and have him to thank.

Friday,06,September,2024,18:45:30:48210
VCDS -- Windows Based VAG/VAS Emulator Running on Windows 7 x64
VCDS Version: 24.7.0.0 (x64)
Data version: 20240715 DS356.3
www.Ross-Tech.com


VIN: WAUDL74F65N037903 License Plate: 09/06/2024
Mileage: 188400km-117066mi Repair Order:



--------------------------------------------------------------------------------
--------------------------------------------------------------------------------


Chassis Type: 4F (4F0)
Scan: 01 02 03 05 07 08 09 0E 0F 15 16 17 19 36 37 42 46 47 4F 52
53 55 56 61 62 67 72 76 77

VIN: WAUDL74F65N037903 Mileage: 188400km-117066miles

00-Steering Angle Sensor -- Status: OK 0000
01-Engine -- Status: OK 0000
02-Auto Trans -- Status: OK 0000
03-ABS Brakes -- Status: OK 0000
05-Acc/Start Auth. -- Status: OK 0000
07-Control Head -- Status: OK 0000
08-Auto HVAC -- Status: OK 0000
09-Cent. Elect. -- Status: OK 0000
0E-Media Player 1 -- Status: OK 0000
0F-Digital Radio -- Status: Malfunction 0010
15-Airbags -- Status: OK 0000
16-Steering wheel -- Status: OK 0000
17-Instruments -- Status: OK 0000
19-CAN Gateway -- Status: OK 0000
25-Immobilizer -- Status: OK 0000
36-Seat Mem. Drvr -- Status: OK 0000
37-Navigation -- Status: OK 0000
42-Door Elect, Driver -- Status: OK 0000
46-Central Conv. -- Status: Malfunction 0010
47-Sound System -- Status: OK 0000
4F-Centr. Electr. II -- Status: OK 0000
52-Door Elect, Pass. -- Status: OK 0000
53-Parking Brake -- Status: OK 0000
55-Headlight Range -- Status: OK 0000
56-Radio -- Status: OK 0000
61-Battery Regul. -- Status: OK 0000
62-Door, Rear Left -- Status: OK 0000
67-Voice Control -- Status: OK 0000
72-Door, Rear Right -- Status: OK 0000
76-Park Assist -- Status: Malfunction 0010
77-Telephone -- Status: OK 0000

-------------------------------------------------------------------------------
Address 01: Engine Labels: Redir Fail!
Part No SW: 4F0 910 560 A HW: 4F0 907 559
Component: 4.2L V8/5V G 0010
Revision: -------- Serial number:
Coding: 0007772
Shop #: WSC 09550 758 80885
VCID: 204FD9DCF37FB196E3-8074
VINID: 9D19547071161857800C72400CBF5A91AB

No fault code found.
Readiness: 0110 1101

-------------------------------------------------------------------------------
Address 02: Auto Trans Labels: 09L-927-760.lbl
Part No SW: 4F1 910 156 G HW: 09L 927 156
Component: AG6 09L 4.2L5V USA 0070
Revision: --H01--- Serial number: 0044539
Coding: 0001002
Shop #: WSC 02327 785 00200
VCID: 285FC1FC9B4F49D6AB-807C

No fault code found.

-------------------------------------------------------------------------------
Address 03: ABS Brakes Labels: 4F0-910-517.clb
Part No SW: 4F0 910 517 E HW: 4F0 614 517 A
Component: ESP8 quattro H03 0010
Revision: 00000000 Serial number: 00000000000000
Coding: 0004456
Shop #: WSC 02327 785 00200
VCID: 2643CFC4915B5FA699-8072

No fault code found.

-------------------------------------------------------------------------------
Address 05: Acc/Start Auth. Labels: None
VCID: 55A1B808BCBD043EC0-FFFE


-------------------------------------------------------------------------------
Address 07: Control Head Labels: 4F0-910-7xx-07-H.clb
Part No SW: 4F0 910 732 Q HW: 4E0 035 729
Component: Interfacebox H43 4610
Revision: 00000000 Serial number: 360GI047502264
Coding: 0000003
Shop #: WSC 02335 785 00200
VCID: 31692C98A895081E7C-8064

Subsystem 1 - Part No: 4F0 910 609
Component: Bedienteil MMIC6H07 0870

Subsystem 2 - Serial number: 00000000040920

Subsystem 3 - Serial number: 0111.08.040000000100010226ÿ

Subsystem 4 - Serial number: 010226ÿ

No fault code found.

-------------------------------------------------------------------------------
Address 08: Auto HVAC Labels: 4F0-910-043.clb
Part No SW: 4F0 910 043 HW: 4F1 820 043 J
Component: KLIMABETAETIGUNGH11 0110
Revision: 00000023 Serial number: 00000000046229
Coding: 0000040
Shop #: WSC 02327 785 00200
VCID: 5BB5AE309A99D24EF6-800E

No fault code found.

-------------------------------------------------------------------------------
Address 09: Cent. Elect. Labels: 4F0-910-279.lbl
Part No SW: 4F0 910 279 AE HW: 4F0 907 279 A
Component: ILM Fahrer H32 0400
Revision: 00000000 Serial number: 4F0907279
Coding: 0102023
Shop #: WSC 00000 000 00000
VCID: 6CD7FDEC4F37A5F60F-8038

Subsystem 1 - Part No: 4F1 910 113 Labels: 1KX-955-119.CLB
Component: Wischer AudiC6 H05 0150
Coding: 00062736
Shop #: WSC 00000

No fault code found.

-------------------------------------------------------------------------------
Address 0E: Media Player 1 Labels: 4E0-910-111.lbl
Part No SW: 4E0 910 111 F HW: 4E0 035 111
Component: CD-Changer H44 0470
Revision: 00000000 Serial number: AUZ5ZBD4026098
Shop #: WSC 00000 000 00000
VCID: 1C37ED2CDF1795763F-8048

No fault code found.

-------------------------------------------------------------------------------
Address 0F: Digital Radio Labels: 4E0-910-593-SIR.lbl
Part No SW: 4E0 910 593 D HW: 4E0 035 593
Component: SDAR SIRIUS H04 0670
Revision: 00000000 Serial number: AUZ4Z7G0219562
Shop #: WSC 00000 000 00000
VCID: 285FC1FC9B4F49D6AB-807C

1 Fault Found:
02635 - Tuner Not Enabled/Activated
000 - -
Freeze Frame:
Fault Status: 01100000
Fault Priority: 7
Fault Frequency: 1
Reset counter: 76
Mileage: 188369 km
Time Indication: 0
Date: 2024.09.05
Time: 16:17:06


-------------------------------------------------------------------------------
Address 15: Airbags Labels: 4F0-910-655-8R.clb
Part No SW: 4F0 910 655 B HW: 4F0 959 655 A
Component: 46 AIRBAG AUDI8RH28 0310
Revision: 09H28000 Serial number: 00359D070B6B
Coding: 0013366
Shop #: WSC 22163 444 58758
VCID: 2643CFC4915B5FA699-8072

Subsystem 1 - Part No: 4F0 910 339
Component: BF-Gewichtsens. 002 0040

Subsystem 2 - Serial number: 6332CSME037648593

Subsystem 3 - Serial number: 6342CSME03127952Y

Subsystem 4 - Serial number: 6351HSME03664F045

Subsystem 5 - Serial number: 6361HSME03594F6FP

Subsystem 6 - Serial number: 6371VSME031C00649

Subsystem 7 - Serial number: 6381VSME031C4809L

No fault code found.

-------------------------------------------------------------------------------
Address 16: Steering wheel Labels: 4F0-910-549.lbl
Part No SW: 4F0 910 549 HW: 4F0 953 549 B
Component: Lenksäulenmodul H07 0230
Revision: 00H07000 Serial number: 90022042160019
Coding: 0012241
Shop #: WSC 02323 785 00200
VCID: 66C38FC451DB9FA659-8032

Subsystem 1 - Part No: XXXXXXXXXXX
Component: Lenkradmodul H05 0080

No fault code found.

-------------------------------------------------------------------------------
Address 17: Instruments Labels: 4F0-920-KOM-V1.clb
Part No SW: 4F0 910 900 A HW: 4F0 920 950 M
Component: KOMBIINSTR. M73 H08 0460
Revision: 00200000 Serial number: 4I250A384
Coding: 0065203
Shop #: WSC 45478 001 104857
VCID: 1E33E724C90B8766D1-804A

No fault code found.

-------------------------------------------------------------------------------
Address 19: CAN Gateway Labels:. 4F0-910-468.clb
Part No SW: 4F0 910 468 A HW: 4F0 907 468 B
Component: Gateway H09 0030
Revision: 09 Serial number: 080080472602E0
Coding: ECFE73CC1B7904
Shop #: WSC 23011 444 84441
VCID: 275DC2C0965146AEA2-8072

No fault code found.

-------------------------------------------------------------------------------
Address 36: Seat Mem. Drvr Labels: None
Part No SW: 4F0 910 760 HW: 4F0 959 760
Component: Sitzmemory FS H04 0050
Revision: 00000000 Serial number: 00000000896400
Coding: 0082946
Shop #: WSC 02327 785 00200
VCID: 61C99CD8B8F5F89EAC-8034

No fault code found.

-------------------------------------------------------------------------------
Address 37: Navigation Labels: 4E0-910-88x-37.lbl
Part No SW: 4E0 910 888 M HW: 4E0 919 887 C
Component: MNS US H44 1100
Revision: 00000000 Serial number: 378B-057517919
Shop #: WSC 23011 444 57521
VCID: 387F11BC4BEFD9563B-806C

No fault code found.

-------------------------------------------------------------------------------
Address 42: Door Elect, Driver Labels: 4F0-910-793-42.lbl
Part No SW: 4F0 910 793 B HW: 4F0 959 793 B
Component: TSG FA H10 0020
Revision: 00000000 Serial number: a•
Coding: 0035691
Shop #: WSC 02327 785 00200
VCID: 2959C4F8804570DEB4-807C

No fault code found.

-------------------------------------------------------------------------------
Address 46: Central Conv. Labels:. 4F0-910-289.lbl
Part No SW: 4F0 910 289 E HW: 4F0 907 289 E
Component: Komfortgeraet H14 0090
Revision: 00900014 Serial number: 01000543210000
Coding: 0423997
Shop #: WSC 02335 785 00200
VCID: 2C573DEC8FB765F64F-8078

Subsystem 1 - Part No: 1K0 951 605 A
Component: LIN BACKUP HORN H01 1201

1 Fault Found:
01134 - Alarm Horn (H12)
012 - Electrical Fault in Circuit
Freeze Frame:
Fault Status: 01101100
Fault Priority: 3
Fault Frequency: 254
Reset counter: 78
Mileage: 180055 km
Time Indication: 0
Date: 2019.08.12
Time: 08:51:35


-------------------------------------------------------------------------------
Address 47: Sound System Labels: 4F0-910-223-AS.lbl
Part No SW: 4F0 910 223 G HW: 4F0 035 223
Component: Amp.-ASK H09 0350
Revision: 14S00001 Serial number: 01907040022165
Coding: 0000016
Shop #: WSC 02335 785 00200
VCID: 224BD3D4FD73A386F5-8076

No fault code found.

-------------------------------------------------------------------------------
Address 4F: Centr. Electr. II Labels: 4F0-910-280.lbl
Part No SW: 4F0 910 280 HW: 4F0 907 280 A
Component: ILM Beifahrer H07 0040
Revision: Serial number: 00000000024766
Coding: 0011114
Shop #: WSC 02323 785 00200
VCID: 5EB3A724898BC76691-800A

No fault code found.

-------------------------------------------------------------------------------
Address 52: Door Elect, Pass. Labels: 4F0-910-793-52.lbl
Part No SW: 4F0 910 793 B HW: 4F0 959 792 B
Component: TSG BF H10 0020
Revision: 00000000 Serial number: ‚™
Coding: 0035691
Shop #: WSC 02327 785 00200
VCID: 2959C4F8804570DEB4-807C

No fault code found.

-------------------------------------------------------------------------------
Address 53: Parking Brake Labels: 4F0-910-801.clb
Part No SW: 4F0 910 801 C HW: 4F0 907 801 A
Component: EPB CDEC0080 H04 0080
Revision: --H04---
Coding: 0006022
Shop #: WSC 23011 444 57521
VCID: 204FD9DCF37FB196E3-8074

No fault code found.

-------------------------------------------------------------------------------
Address 55: Headlight Range Labels: 4F0-910-357.lbl
Part No SW: 4F0 910 357 E HW: 4F0 907 357 E
Component: AFS 1 H01 0010
Revision: 00000001 Serial number:
Coding: 0000016
Shop #: WSC 22163 444 58758
VCID: 285FC1FC9B4F49D6AB-807C

Subsystem 1 - Part No: 4F0 941 329 A
Component: AFS-Modul links H05 0010

Subsystem 2 - Part No: 4F0 941 329 A
Component: AFS-Modul rechtsH05 0010

No fault code found.

-------------------------------------------------------------------------------
Address 56: Radio Labels: 4E0-910-541.lbl
Part No SW: 4E0 910 541 T HW: 4F0 035 541
Component: TUNER EU/US/RDW H41 0630
Revision: 00000000 Serial number: 352HS047550764
Coding: 0000002
Shop #: WSC 02327 785 00200
VCID: 31692C98A895081E7C-8064

No fault code found.

-------------------------------------------------------------------------------
Address 61: Battery Regul. Labels: 4F0-910-181.clb
Part No SW: 4F0 910 181 E HW: 4F0 915 181 A
Component: ENERGIEMANAGER H11 0400
Revision: 00000000 Serial number: 00000000040420
Shop #: WSC 26153 444 00583
VCID: 2345D6D0E269AA8EFE-8076

Subsystem 1 - Part No: 4F0 915 105 D
Component: von VA0 1408090073
Coding: 344630393135313035442056413031343038303930303733
Shop #: WSC 00000 640 00290

No fault code found.

-------------------------------------------------------------------------------
Address 62: Door, Rear Left Labels: 4F0-910-795.lbl
Part No SW: 4F0 910 795 HW: 4F0 959 795
Component: TSG HL H09 0010
Coding: 0035370
Shop #: WSC 02327 785 00200
VCID: 69D984F840C5B0DE74-803C

No fault code found.

-------------------------------------------------------------------------------
Address 67: Voice Control Labels: 4E0-910-75x-67.lbl
Part No SW: 4E0 910 754 Q HW: 4E0 035 753 A
Component: SDS 3501 US H45 0630
Revision: 00000000 Serial number: 00000407260196
Shop #: WSC 12336 024 394758
VCID: 3467258C57873D3617-8060

No fault code found.

-------------------------------------------------------------------------------
Address 72: Door, Rear Right Labels: 4F0-910-795.lbl
Part No SW: 4F0 910 795 HW: 4F0 959 794
Component: TSG HR H09 0010
Coding: 0035370
Shop #: WSC 02327 785 00200
VCID: 69D984F840C5B0DE74-803C

No fault code found.

-------------------------------------------------------------------------------
Address 76: Park Assist Labels: 4Fx-910-283.lbl
Part No SW: 4F0 910 283 HW: 4F0 919 283
Component: Parkhilfe 4-Kan H09 0020
Revision: --.--.-- Serial number: 11730420500316
Coding: 0001206
Shop #: WSC 131071 1023 2097151
VCID: 61C99CD8B8F5F89EAC-8034

3 Faults Found:
01545 - Sensor for Parking Aid; Rear Left (G203)
009 - Open or Short to Ground - Intermittent
Freeze Frame:
Fault Status: 00101001
Fault Priority: 3
Fault Frequency: 1
Reset counter: 117
Mileage: 188369 km
Time Indication: 0
Date: 2024.09.06
Time: 08:39:55

01548 - Sensor for Parking Aid; Rear Right (G206)
009 - Open or Short to Ground - Intermittent
Freeze Frame:
Fault Status: 00101001
Fault Priority: 3
Fault Frequency: 1
Reset counter: 117
Mileage: 188369 km
Time Indication: 0
Date: 2024.09.06
Time: 08:39:55

01546 - Sensor for Parking Aid; Rear Mid-Left (G204)
009 - Open or Short to Ground - Intermittent
Freeze Frame:
Fault Status: 00101001
Fault Priority: 3
Fault Frequency: 1
Reset counter: 117
Mileage: 188369 km
Time Indication: 0
Date: 2024.09.06
Time: 08:39:55


-------------------------------------------------------------------------------
Address 77: Telephone Labels: 4E0-910-336.lbl
Part No SW: 4F0 910 336 H HW: 4E0 862 335
Component: Handyvorb2 H10 1130
Revision: 00000000 Serial number: 00000007500532
Coding: 0010900
Shop #: WSC 00000 000 00000
VCID: 285FC1FC9B4F49D6AB-807C

No fault code found.

End-------------------------(Elapsed Time: 06:22)--------------------------

[Avantly]

I am glad you got it fixed! That is great.

Now I am sitting here, chuckling, thinking "I am glad that the Audi software engineers decided to incorporate a software strategy that decides whether or not the orientation of the sensor seems plausible, as opposed to just trusting it". What would happen if the ABS/Air bag system decided that the car was suddenly upside down or on its side? Deploy some air bags? Fire the ejection seat? Activate the emergency flotation system? I am glad that software engineers are at least this competent, I can't imagine the chaos if the system decided to blindly trust sensors like this.

[jv_atc]

LOL