wow what a surprise FAULT CODES

[canadianA4B7]

so got these today, any one have any suggestions? I should likely run a boost leak test and see what I can come up with for extra air escaping from the system. but as for fueling glad its rich not lean!!! maybe ive got some turbo issues on that side? perhaps a wastegate that isn't opening properly?

P1421-17829 - Secondary Air Injection Solenoid Valve (N112)
P1421 - 35-10 - Short to Ground - Intermittent
P1137-17545 - Fuel Trim: Bank 1 (Add)
P1137 - 35-10 - System too Rich - Intermittent
P1139-17547 - Fuel Trim: Bank 2 (Add)
P1139 - 35-10 - System too Rich - Intermittent

now further inspection of computer brought forward a number of fault codes!!! this is just getting better!! replaced motor in the car with a "great condition motor" FML this things has got more codes then the last motor which I thought just needed some new turbos!!!! i swapped over the N75 valve tonite prior to reading codes. should i plan on spending some serious cash? ive got a timing belt job about to commence as soon as my thermostat housing comes in.

heres what VAG COM had in the AUTO SCAN section. the others were just the OBD2 codes that are present.

VIN: WAUYP54BX1N160007 Mileage: 310070km/192668miles
-------------------------------------------------------------------------------
Address 01: Engine Labels: 078-907-551-AZA.lbl
Part No: 4Z7 907 551
Component: 2.7l V6/5VT G 0003
Coding: 06712
Shop #: WSC 02325
VCID: 55A15265AF1FFEB6975-5140
WAUYP54BX1N160007 AUZ7Z0A1845742

14 Faults Found:
16805 - Warm Up Catalyst; Bank 1
P0421 - 35-00 - Efficiency Below Threshold
16815 - Warm Up Catalyst; Bank 2
P0431 - 35-00 - Efficiency Below Threshold
these are because I have no cats at all and I know they will be gone once cats are installed

17963 - Charge Pressure
P1555 - 35-10 - Maximum Limit Exceeded - Intermittent
17819 - Secondary Air Injection System; Bank 2
P1411 - 35-10 - Insufficient Flow - Intermittent
16487 - Mass Air Flow Sensor (G70)
P0103 - 35-10 - Signal too High - Intermittent
17833 - EVAP Purge Valve (N80)
P1425 - 35-10 - Short to Ground - Intermittent
17880 - EVAP Leak Detection Pump
P1472 - 35-10 - Short to Ground - Intermittent
17843 - Secondary Air Pump Relay (J299)
P1435 - 35-10 - Short to Ground - Intermittent
17938 - Camshaft Timing Adjustment
P1530 - 35-10 - Short to Ground - Intermittent
17829 - Secondary Air Injection Solenoid Valve (N112)
P1421 - 35-10 - Short to Ground - Intermittent
18010 - Power Supply Terminal 30
P1602 - 35-10 - Voltage too Low - Intermittent
17545 - Fuel Trim: Bank 1 (Add)
P1137 - 35-10 - System too Rich - Intermittent
17547 - Fuel Trim: Bank 2 (Add)
P1139 - 35-10 - System too Rich - Intermittent
16514 - Oxygen (Lambda) Sensor B1 S1
P0130 - 35-10 - Malfunction in Circuit - Intermittent
Readiness: 0000 0000

I also found recently that the ground under the coolant tank had no nut on it and it had likely been that way for some time. should i clear the codes and see what comes back over the next few days?

[ENDEE666]

What are these fault codes you speak of?? I am not familiar with them. I am only the owner of two C5 2.7's (current) and a few other VAG products historically..

My troubleshooting usually starts with clearing them & see what comes back.

Is your car tuned? If so, see if the tuner can delete rear O2's and SAI. That's what I did on the Allroad. My SAI was making a noise & code every few days, and I planned on deleting it anyway. Since deleting it at the ECU, no codes for that. And rear O2's were deleted because cats will go buh-bye very soon..

All the fuel trims & rich readings are likely from the cats. The Evap one would probably go away. The cam one & the MAF one would concern me to probe more..

[ENDEE666]

Random thought, how is your TBB? Any boost leaks maybe?

[canadianA4B7]

so im not tuned at all!! been looking into going NEFMOTO actually, but i wanted to clear up all my issues prior. the one i had just after motor was installed was a boost pressure one but i cleared the codes and it never came back. so now i was having some issues when getting onto highway, the car would chug/bog at 4200 RPM so i figured bad DV's and likely N75. now after the scan i started the car hood up to hear the SAI and well as everyone would expect shes making a bit of noise. nothing crazy but much more then you would expect. so thanx to 034 i actually have the SAI delete plates sitting in a box... somewhere!!!!

im going to need a tune!!! soon i think. the cats i have no interest in re installing, the EVAP (N80 am i correct) i removed from the other engine and will likely just toss it in i should have today but i sliced a finger open somehow and well got ticked off and called her quits.
so i have a 034 TBB and the other MAF sensor from engine 1 should i install those pieces also? i know the other MAF was good as it never threw a code.

cam codes should i just get new cam sensors? while the cars in for the timing belt job? or grab them off spare motor aswell??? being that i know the shit on my other motor was problem free. and the previous owner has records of every nut and bolt he had replaced. IE the brand new DV's he had installed "to pass the safty ;-)" is what he said to me with a wink!!

[rollerton]

No way. All readiness checks clear and all your faults are intermittent. Clear and drive. Hows your battery? Wiring harness..? I don't know, just guessing, but all of those codes being intermittent and readiness passing makes me thing a little more objective. And...all those 'short to ground' faults ? I'm thinking electrical interruption or voltage?

[canadianA4B7]

No way. All readiness checks clear and all your faults are intermittent. Clear and drive. Hows your battery? Wiring harness..? I don't know, just guessing, but all of those codes being intermittent and readiness passing makes me thing a little more objective. And...all those 'short to ground' faults ? I'm thinking electrical interruption or voltage?

ohh she has been and electrical asshole as of lately but i found that one ground that im hoping was what caused all this nonsense, im clearing codes right now and i have to run out a bit later tonite, ill be sure to take a tear down the highway and put it through a few 2000-6000RPM runs. im hoping the slight chug has gone now that ive cleared codes, and changed the N75. if not ive got a N80 sitting on passengers seat ill swap out tomorrow. and ill also see weather i can get a base tune to get the car onto via nefmoto. Im hoping one of the GURU's from there will read this thread and hopefully have some insight and perhaps a base file i can run. i need to do some more research on that software. id like to get a tune and that done this weekend. fingers crossed the snow holds off.

[ddillenger]

Think you need to check your fuses.

Number 34 specifically.

[canadianA4B7]

Think you need to check your fuses.

Number 34 specifically.

just emailed you and am gonna check that fuse right now. thanx. fuses are all good, im running without 27, 35 trailer hitch, 42 or 43 whichever is the RADIO (A6).

if that fuse had been pulled out at some point would that cause some of those issues?? doesn't that fuse need to be pulled to re-fill the fuel lines say after motor was replaced? i think i had to do that on my A4 when i had it apart. had to purge the fuel line by removing fuse for engine so that the fuel pump would fill the lines to the engine. anyway all are good replaced 34 just for piece of mind.

Just had a thought, last week i found the loose ground under the coolant tank, and i only left the battery out of the car for 24 hours for it to charge. now the CELL was off for a few days after charging the battery. i assume it will not remove all of the codes???? even though the car was without power... but i thought that after the system was powerless for over a certain amount of time the inter storage would be erased?

[ddillenger]

The codes will remain stored until cleared. My advice is to clear them, then drive, see what comes back (assuming fuse 34 is good).

[canadianA4B7]

The codes will remain stored until cleared. My advice is to clear them, then drive, see what comes back (assuming fuse 34 is good).

yup thanx, ive cleared everything and the fuse is good. so after a good drive i know ill get back my CAT codes but i hope nothing else.

[canadianA4B7]

after clearing the codes and and then taking the for a good drive to get the cell to turn back on there are only 3 Fault codes that came back on.

Address 01: Engine Labels: 078-907-551-AZA.lbl
Part No: 4Z7 907 551
Component: 2.7l V6/5VT G 0003
Coding: 06712
Shop #: WSC 02325
VCID: 55A15265AF1FFEB6975-5140
WAUYP54BX1N160007 AUZ7Z0A1845742

3 Faults Found:
16805 - Warm Up Catalyst; Bank 1
P0421 - 35-00 - Efficiency Below Threshold
16815 - Warm Up Catalyst; Bank 2
P0431 - 35-00 - Efficiency Below Threshold
17963 - Charge Pressure
P1555 - 35-10 - Maximum Limit Exceeded - Intermittent
Readiness: 0010 1000

it seems that i still have one problem. im going to look deeper into this. anyone ever had this cell send me suggestions please. also my rear air ride finally has come to an end. drove a few guys back and forth to school this past week, yesterday i noticed some weird actions from the rear. woke up this am and the car was sitting in position 1 after being left on level 2. started the car and the air ride light lit up while she filled the bags and got back up to level 2. damn. it may not be bags as i smelt a bit of a burning from the trunk area in the car. maybe ive got a bad compressor/air pump.

[ratherb1]

I wouldn't worry about the below threshold garbage....but the charge pressure exceeded, check that the n75 is hooked up especially the bottom line ......or you might have to check it for leaks

[canadianA4B7]

I just changed N75 out yesterday! Lol maybe the one i had was actually fine! I will switch it back again. Can someone tell me the size of the pipe right in front of the maf sensor? Or what size the large end of the Y pipe is. I have a boost leak tester but do not have correct size coupling to adapt it to the Y-pipe. And have never thought to measure it myself. Im assumeing now that its a boost leak. As both N75 i checked and only blew air through 1 port.

[ratherb1]

A 3" furnco (3" PVC rubber coupling) attached to the y pipe works like a charm.....is the bottom part of the n75 on tight with no leaks ? You should also check to make sure the line is good no holes

[DCandDGK]

Make one of these. Probably the best $20-$25 I have spent as an Audi tech.
http://www.awe-tuning.com/media/pdf/27t_pressure_tester.pdf

[canadianA4B7]

A 3" furnco (3" PVC rubber coupling) attached to the y pipe works like a charm.....is the bottom part of the n75 on tight with no leaks ? You should also check to make sure the line is good no holes

I have a boost leak tester, but the ID is 3" and it did NOT fit onto the end of the MAF. I did not try it directly to the Y-pipe. But the Y-pipe inlet measures 3 3/8". Just went and measured it. Ill order a coupler and fit it onto my leak tester, and onto the Y-pipe. And as soon as i get it ill check it for leaks. I assume that ive got a bad leak. My mileage has been crap since the motor swap i assume an excess of air could be the cause. This could also explain my jog/chug/cut of power at 5500RPM.

[ratherb1]

I have a boost leak tester, but the ID is 3" and it did NOT fit onto the end of the MAF. I did not try it directly to the Y-pipe. But the Y-pipe inlet measures 3 3/8". Just went and measured it. Ill order a coupler and fit it onto my leak tester, and onto the Y-pipe. And as soon as i get it ill check it for leaks. I assume that ive got a bad leak. My mileage has been crap since the motor swap i assume an excess of air could be the cause. This could also explain my jog/chug/cut of power at 5500RPM.

Yea the y pipe isn't 3 inches exactly but the 3" PVC coupler works great ....that 3" PVC measurement comes from Inside diameter.....this is why I said PVC specifically.......if you suspect a leak unplug the maf see if it runs better .......that will narrow it down abit, if you have a 3" boost leak tester put that baby on the y pipe not the maf ....

[canadianA4B7]

AND TODAY

Address 34: Level Control Labels: 4Z7-907-553.lbl
Part No: 4Z7 907 553 B
Component: - 2C1A1 X031
Coding: 25500
Shop #: WSC 09999
VCID: 44879F215485773EF0B-5122

2 Faults Found:
01400 - Suspension Level Control
53-10 - Supply Voltage Too Low - Intermittent
01316 - ABS Control Module
79-00 - Please Check Fault Codes

and this
1 Fault Found:
00991 - Interior Lights
28-10 - Short to Plus - Intermittent
(any idea how to figure out which light? or should i go and pull out some bulbs and hope for the best?)

I think the air ride control module has kicked the bucket. the bags seem to be holding air but i smelt some burning the other day and assume the module is done. theres a member with some parts here on the classifieds here and i hope to pick some stuff up from him. damn allroad!!!