My S3 Lost Boost. Limp mode?

[YegorS]

Hey guys,

The car lost boost on hard acceleration. No lights, no noises, no smoke, nothing. I was able to drive fine all the way home for about 30 miles or so. The boost gauge shows nothing. Restarted the car after parked an hour, reved, but there is still no boost.

I have DP, JB1 and aFe dry drop-in filter. Going to scan the car with VCDS tomorrow morning, just wanted to know if anyone had a similar malfunction.

[roadrunner_oz]

Boost leak?...check hoses on each side of intercooler and the charge pipe

[YegorS]

Thank you roadrunner! Anything else I should take into consideration? I also did the so-called intake mode yesterday before replacing the air filter: opened up the driver's side part of the intake and blocked the back opening on the passenger side. Could this have some kind of effect, too?

[Blaine]

Thank you roadrunner! Anything else I should take into consideration? I also did the so-called intake mode yesterday before replacing the air filter: opened up the driver's side part of the intake and blocked the back opening on the passenger side. Could this have some kind of effect, too?

Shouldn't. Does the car still pull like your getting boost? Seems unusual that you would have Zero boost and no CEL's.

As stated before, do a good visual of all plumbing and vacuum lines. I'm guessing you may of knocked off a line somewhere.

[YegorS]

Shouldn't. Does the car still pull like your getting boost? Seems unusual that you would have Zero boost and no CEL's.

As stated before, do a good visual of all plumbing and vacuum lines. I'm guessing you may of knocked off a line somewhere.

No, it doesn't pull fine, definitely a loss of power. Will check the plumbing and vacuum lines in the morning.

[roadrunner_oz]

Intake leak wouldn't cause loss of boost, unless it is blocked with a bird the S3 sucked up ;)

Other cars I have had haven't always thrown a CEL when boost is lost

[slick99]

i got similar mods like yours on my A3 except the oem intake mods, Check your JB1 all cables connected and boost pipe as well.

[YegorS]

So I started the car in the morning and it was like nothing happened: again, no lights nothing, the boost was back and everything working fine.

We scanned the car and here is the log. I am including malfunctions only. Please note, that the first code was thrown more than one week ago and we intentionally didn't clear that to see if it repeats or not.

The plumbing, everything seems to be intact. Any thoughts, guys?

-------------------------------------------------------------------------------
Chassis Type: FF (5Q0)
Scan: 01 02 03 05 08 09 10 14 15 16 17 19 22 2B 3C 42 44 52 55 5F
6C A9

VIN: --- Mileage: 6504km-4041miles

01-Engine -- Status: Malfunction 0010
02-Auto Trans -- Status: OK 0000
03-ABS Brakes -- Status: OK 0000
05-Acc/Start Auth. -- Status: OK 0000
08-Auto HVAC -- Status: OK 0000
09-Cent. Elect. -- Status: OK 0000
10-Park/Steer Assist -- Status: OK 0000
14-Susp. Elect. -- Status: OK 0000
15-Airbags -- Status: OK 0000
16-Steering wheel -- Status: OK 0000
17-Instruments -- Status: Malfunction 0010
19-CAN Gateway -- Status: OK 0000
22-AWD -- Status: OK 0000
2B-Steer. Col. Lock -- Status: OK 0000
3C-Lane Change -- Status: OK 0000
42-Door Elect, Driver -- Status: OK 0000
44-Steering Assist -- Status: OK 0000
52-Door Elect, Pass. -- Status: OK 0000
55-Headlight Range -- Status: OK 0000
5F-Information Electr. -- Status: Malfunction 0010
6C-Back-up Cam. -- Status: OK 0000
A9-Struct. Borne Sound -- Status: OK 0000

-------------------------------------------------------------------------------
Address 01: Engine (J623-CYFB) Labels: 06K-907-425-V1.clb
Part No SW: 8V0 906 259 H HW: 06K 907 425 E
Component: 2.0l R4 TFSI H13 0002
Revision: --H13---
Coding: 0A1D00122426000E3004
Shop #: WSC 06385 790 00016
ASAM Dataset: EV_ECM20TFS0208V0906259H 001003
ROD: EV_ECM20TFS0208V0906259H_AU37.rod
VCID: 458BBE47C4F029160D-8010

1 Fault Found:
18932 - Oxygen (Lambda) Sensor B1 S2
P013F 00 [096] - Response too Slow Lean to Rich
Intermittent - Not Confirmed - Tested Since Memory Clear
Freeze Frame:
Fault Status: 00000001
Fault Priority: 2
Fault Frequency: 1
Mileage: 5999 km
Date: 2016.04.10
Time: 00:10:08

Readiness: 0000 0000

-------------------------------------------------------------------------------
Address 02: Auto Trans (J743) Labels: 0D9-927-770.clb
Part No SW: 0D9 300 012 HW: 02E 927 770 AQ
Component: DQ250-6A MQB H53 4903
Revision: 06253104 Serial number: TFK01509120751
Coding: 0014
Shop #: WSC 04742 780 00200
ASAM Dataset: EV_TCMDQ250021 001001
ROD: EV_TCMDQ250021_AU37.rod
VCID: 53AF901F3AA487A693-8006

6 Faults Found:
21153 - Gear 1
P072C 00 [002] - Not Selectable
Intermittent - Not Confirmed - Tested Since Memory Clear
Freeze Frame:

21159 - Gear R
P072B 00 [002] - Not Selectable
Intermittent - Not Confirmed - Tested Since Memory Clear
Freeze Frame:

10731 - Valve 3 in Transmission Part 1
P174A 00 [002] - Electrical malfunction
Intermittent - Not Confirmed - Tested Since Memory Clear
Freeze Frame:

10657 - RPM Signal from ECU
P0726 00 [002] - Implausible Signal
Intermittent - Not Confirmed - Tested Since Memory Clear
Freeze Frame:

10906 - Cooling Oil Valve
P179D 00 [002] - Electrical Malfunction
Intermittent - Not Confirmed - Tested Since Memory Clear
Freeze Frame:

10763 - Starter Enable from Selector Lever Sensor System
P1734 00 [002] - -
Intermittent - Not Confirmed - Tested Since Memory Clear
Freeze Frame:

-------------------------------------------------------------------------------
Address 17: Instruments (J285) Labels: 5G0-920-XXX-17.clb
Part No SW: 8V0 920 972 B HW: 8V0 920 972 B
Component: KOMBI H03 6420
Coding: 0BED181B3B88D7050201E8001800000000000000
Shop #: WSC 06385 790 00016
ASAM Dataset: EV_DashBoardVDDMQBAB 009046
ROD: EV_DashBoardVDDMQBAB_AU37.rod
VCID: 3D7BD6A7AC2061D655-8068

1 Fault Found:
13639427 - Databus
U1123 00 [008] - Received Error Message
Intermittent - Confirmed - Tested Since Memory Clear
Freeze Frame:
Fault Status: 00000001
Fault Priority: 6
Fault Frequency: 1
Reset counter: 38
Mileage: 6469 km
Date: 2016.04.17
Time: 20:15:36

[JGreen76]

How do your plugs look?

[YegorS]

How do your plugs look?

I assume you are referring to JB1: everything looks fine. I am going to intensively look later today.

[roadrunner_oz]

remove the JB1 is your first step, then re-test

[YegorS]

We just thoroughly checked the car and rescanned it. The previous codes didn't show anymore and everything is intact. The car runs fine. I just don't know what happened.

[Blaine]

We just thoroughly checked the car and rescanned it. The previous codes didn't show anymore and everything is intact. The car runs fine. I just don't know what happened.

Seems a few S3's are having the same issues of CEL and not running right then *poof* all perfect again.. Seems ECU related if they car just up and runs fine again magically. Or faulty sensors.. wiring... Electrical Gremlins... the worst kind of issues u can have. I'd rather have piston failures.... at least you know how to fix it.

[JGreen76]

I assume you are referring to JB1: everything looks fine. I am going to intensively look later today.

No, not the JB1. If you've been running it for a while you might want to check your spark plugs. Cylinder will run hotter, need to run a cooler plug. Plugs will burn out faster.

Also, did you through a EPC or CEL?

[GWMs3]

I just had the loss of boost happen to me yesterday, mothers day. I do have the Unitronic Stage 1 installed on my '16 S3 also, which made me think it was an "overboost" issue.

I was turning onto a back road and put it to the floor, no boost and only reved to 5k. Absolutely no warning lights, odd noises, nothing.

I shut the car down, restarted, all good again. 10 miles later ... pulling great, then stops pulling at 60, complete loss of boost. Shut it down again, restored boost back to normal. Drove it 60 miles home without issue, but refrained from going WOT.

Pulled codes today, nothing there.

If anyone has any info on this, it's greatly appreciated.

**UPDATE**

I have yet to have any of the same issues. I have been carrying around my laptop and VCDS to look further into it during the event. I will continue to update if I find anything.

[drew4392]

Very odd, sorry you guys are experiencing this.

Subscribed.

[extensive]

I've also experienced problems where my turbo just shuts off on me. I throw an EPC randomly while driving and my turbo just turns off. I think it has happened 2-3 times in the last year for me. Each time it was fixed by just turning to car off and on. Not sure why.

[drew4392]

I've also experienced problems where my turbo just shuts off on me. I throw an EPC randomly while driving and my turbo just turns off. I think it has happened 2-3 times in the last year for me. Each time it was fixed by just turning to car off and on. Not sure why.

Tuned?

Had no idea this was happening so often...

[extensive]

Tuned?

Had no idea this was happening so often...

Yeah, I have the APR IS38 tune on a 2015 A3 2.0T.


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