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Audi A3 2.0 TDI..Limp mode?with code p0234


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#1 boab

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Posted 01 July 2011 - 07:37 AM

I'm looking for some technical help with a 2006 A3 2.0 TDI (BKD engine 140bhp with 75K). For a month or so i had problems at motorway speeds (80 mph+) of the car entering limp mode. Sometimes it gave a fault code, sometimes it didn't. It was however P0234 (overboost). I put this down to a possible carbon build up on the turbine vanes (apparantly a common issue). The turbo eventually packed in (main bearing) and i'm now enjoying a recon turbo. Problem is, it has still got the limp mode issue at higher speeds as before-giving the same fault code-overboost. I have an OBDII reader and the last fault gave me the following freeze frame data:
DTCFRZF P0234
LOAD_PCT (%) 71.4
ETC (F) 198
MAP (inHg) 69.4
RPM (/min) 3119
VSS (mph) 85
MAF (lb/min) 15.050
TP (%) 94.9

Is there anything in the above that could point me in the direction of finding what the problem is?
any help appreciated.cheers

Edited by boab, 01 July 2011 - 07:39 AM.


#2 joe_60

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Posted 01 July 2011 - 09:13 PM

Im sure there is a modified wiring loom that goes from the ECU to the MAP sensor. There is a TPI on this if you visit your local Audi dealer :)

#3 matt@onlychargeddubs

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Posted 02 July 2011 - 04:52 PM

as above!!

common fault, make sure to get all the engine bay earth points cleaned too!

#4 boab

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Posted 05 July 2011 - 02:43 PM

is this a recall from audi?whats wrong with harness?is it bad connections etc?cheers

#5 matt@onlychargeddubs

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Posted 05 July 2011 - 03:11 PM

Not a recall just a known repair vw/Audi put out to help diagnose faults faster and cheaper etc etc

The fault is resistance in the wiring causing an incorrect signal which causes the car to believe it's either under or over boosting causing the limp mode.

You can buy the loom required for about £30 iirc. It's not an impossible task, battery tray and airbox out, wipers off and scuttle off too, then run the new loom directly from the ecu to the sensor in the boost pipe. Is rather tricky taking ecu plugs apart if you've not done it before.

#6 boab

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Posted 05 July 2011 - 05:46 PM

great cheers,can or could this harness affect the performance?cheers

#7 boab

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Posted 05 July 2011 - 07:00 PM

where is map sensor located?as maf is in top pipe.its bkd engine.cheers

#8 matt@onlychargeddubs

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Posted 05 July 2011 - 10:02 PM

Yeah it does as it creates a false fault code!

The boost pressure and map sensor (2 into 1) is located in a solid boost pipe joining the intercooler and intake valve.

Yeah MAF or air mass is after the airbox before the turbo

#9 boab

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Posted 06 July 2011 - 08:27 PM

thats great cheers for the help guys.

#10 lonn2se

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Posted 10 July 2011 - 10:49 AM

Hello. I have the same problem to my VW Golf -04 BKD engine.
What is the partnr (ETK). for the modified wiring loom?