EPC and traction control light comes on and then car goes into limp mode.

[dontclickonthis]

Hey,

I have a 2004 A3 1.6, every so often the epc and traction lights comes on and the car go's into limp mode. When I turn the car off and back on and it clears it and it might not happen again then for a few weeks. Then it might happen 3/4 times while I'm driving an hour down the road. I had my mate plug the car into his comp and get the fault codes. So hoping someone might have an idea what might be causing it. I have noticed that the wire loom going to the throttle body had been cut and reconnected just before it plugs into the throttle body, the last owner had cut and rejoined for what I don't know. but the connections look ok.


Thanks in advance.

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3 Faults Found:


17950 - Angle Sensor 1 for Throttle Actuator (G187)
P1542 - 008 - Implausible Signal - Intermittent
Freeze Frame:
RPM: 4224 /min
Bin. Bits: 00001000
Load: 81.6 %
Load: 31.0 %


17579 - Angle Sensor 2 for Throttle Actuator (G188) Implausible Signal
P1171 - 008 - - Intermittent
Freeze Frame:
RPM: 4032 /min
Bin. Bits: 00100000
Load: 37.3 %
Load: 82.7 %


17950 - Angle Sensor 1 for Throttle Actuator (G187)
P1542 - 008 - Implausible Signal
Freeze Frame:
RPM: 4224 /min
Bin. Bits: 00001000
Load: 81.6 %
Load: 31.0 %

[vag_tech]

Well those faults certainly look like there may be an issue with the throttle unit/wiring (if the codes are permanent).
I presume these codes were pulled from the engine ecm. Are you able to do a scan of the ABS module? If you can post those codes, that would be helpful.

[dontclickonthis]

I got another scan done. Again the car is driving fine. The odd time to while I'm sitting at traffic lights I notice the car revs a little uneven. revs past 1000 then just drops back to around 600/700 then back up past 1000. The aircon is off too when that happens.

Thanks in advance.

--------------------------------------------------------------------------------------------------------------------------------------------------------
Chassis Type: 8P (1K0)
Scan: 01 03 08 09 15 16 17 19 25 42 44 46 47 52 56


VIN: Mileage: 179320km/111424miles


00-Steering Angle Sensor -- Status: OK 0000
01-Engine -- Status: Malfunction 0010
03-ABS Brakes -- Status: Malfunction 0010
08-Auto HVAC -- Status: Malfunction 0010
09-Cent. Elect. -- Status: OK 0000
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
42-Door Elect, Driver -- Status: OK 0000
44-Steering Assist -- Status: OK 0000
46-Central Conv. -- Status: OK 0000
47-Sound System -- Status: OK 0000
52-Door Elect, Pass. -- Status: OK 0000
56-Radio -- Status: Malfunction 0010

-------------------------------------------------------------------------------
Address 01: Engine Labels: 06A-906-033-BGU.lbl
Part No: 06A 906 033 DS
Component: SIMOS71 1.6l 2V 5559
Revision: --H03--- Serial number: AUX7Z0D2FN90LD
Coding: 0000071
Shop #: WSC 06435 000 00000
VCID: 73E247E312A68F8696F-8026


5 Faults Found:
17579 - Angle Sensor 2 for Throttle Actuator (G188) Implausible Signal
P1171 - 008 - - Intermittent
Freeze Frame:
RPM: 896 /min
Bin. Bits: 00001000
Load: 9.8 %
Load: 78.4 %
RPM: 704 /min
Bin. Bits: 00001000
Load: 9.8 %
Load: 78.8 %


17950 - Angle Sensor 1 for Throttle Actuator (G187)
P1542 - 008 - Implausible Signal - Intermittent
Freeze Frame:
Mass Air / Rev.: 261.6 mg/str
Bin. Bits: 00000100
Load: 31.4 %
Load: 85.5 %
Mass Air / Rev.: 256.2 mg/str
Bin. Bits: 00001000
Load: 35.7 %
Load: 80.0 %


17950 - Angle Sensor 1 for Throttle Actuator (G187)
P1542 - 008 - Implausible Signal - Intermittent
Freeze Frame:
Mass Air / Rev.: 261.6 mg/str
Bin. Bits: 00000100
Load: 31.4 %
Load: 85.5 %
Mass Air / Rev.: 256.2 mg/str
Bin. Bits: 00001000
Load: 35.7 %
Load: 80.0 %


17950 - Angle Sensor 1 for Throttle Actuator (G187)
P1542 - 007 - Implausible Signal - Intermittent
Freeze Frame:
Mass Air / Rev.: 261.6 mg/str
Bin. Bits: 00000100
Load: 31.4 %
Load: 85.5 %
Mass Air / Rev.: 256.2 mg/str
Bin. Bits: 00001000
Load: 35.7 %
Load: 80.0 %


17796 - Control Module Malfunction - DBW Throttle Monitoring
P1388 - 008 - - Intermittent
Freeze Frame:
Bin. Bits: 00101010
Hex Value: 0x0028
Hex Value: 0x0001
Hex Value: 0x0002


Readiness: 0000 0000


-------------------------------------------------------------------------------
Address 03: ABS Brakes Labels: 1K0-907-379-MK60-F.lbl
Part No: 1K0 907 379 K
Component: ESP FRONT MK60 0103
Coding: 0019077
Shop #: WSC 06435 000 00000
VCID: 3A7CAAC7754C3ECE959-806F


1 Fault Found:
01314 - Engine Control Module
013 - Check DTC Memory - Intermittent

[vag_tech]

If the wiring loom has been messed with, its integrity should be checked first.
If it tests okay, I'd give the throttle a clean and relearn the control stops (basic settings) with VCDS. At this point, ideally, air intake should also be checked for leaks. Also worth monitoring throttle position and accelerator pedal position in measuring blocks (plot on graph).
Let us know how you get on.
Good luck.

[VW-nick]

I had a very similar problem. Kept going into limp mode under hard acceleration. Turned out to be the turbo actuator.

[petar]

dontclickonthis, do you have updates on this issue? Tomorrow I'll take my 2006 Audi A4 1.8T to service center, with exactly the same error codes and vehicle reaction. I will write back soon, I hope

[petar]

FIXED.

After a month in a service center, changed Speed sensor, cleaning and adapt Throttle body, the issue still was active. Finally we try with Throttle body replacement.
Not a solution

Finally, in different service center, the reason was found. Water in the computer. It was able to be repaired, for my luck.

Guys, check your computers FIRST, before taking a decision for parts replacement.

Good luck