Question about 2005 Audi A3

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2004 Audi A3 2.0 TDI - when warm and allowed to idle below 1000 RPM goes into limp idle mode.(ie no response to accel pedal) Removing air mass sensor or intake air sensor/boost sensor plug allows acc pedal response and drive at reduced power. (Both of these sensors are new!) All vacuum pipes are connected to correct places and not blocked - turbo works well. Hall sender at camshaft is secure and in correct position. EGR valve has been cleaned. Injection plungers have been set and computor confirms setting as "spot on". Brake light switch has been renewed. When cold the vehicle goes like the proverbial bat! No stored errors when problem occurs! Dan Varoy

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Dual mass fly wheel, sounds stupid but try it. just done it on mine.
sam

Posted on Mar 14, 2010

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Posted on Jan 02, 2017

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My 2001 525td starts and drives ok but intermittently it wont go above 3000 rpm,if you stop and switch it off it goes ok again for a short while


HI, your car is most likely going into limp mode. The number one cause of this computer shut down restriction- is a Mass-Air Flow sensor malfunction. Fuel trims become erratic and the engine computer puts a order in to limit performance until the original problem is resolved. The fact that you can get performance back after shutting down car and restarting is that the computer is rebooting and most likely the sensor is now functioning properly and or has not set the number of faults required for limp mode. What I would do is have someone with a scanner look for DTC's or engine problem codes, and remember the following: Lean or Rich fuel trims detected bank 1 bank 2 (is a Mass Air flow problem)Replace Mass Air flow sensor assembly. Accelerator position high or low and or erratic is most likely (Pedal sensor) Replace Pedal assembly. Good Luck.

May 18, 2011 | 2007 BMW 525xi Sedan

1 Answer

Dove si trova il sensore temperatura acqua motore nel modello AUDI A4 TDI 1.9, ANNO 2004


Water Thermometer by cooling system is called Engine Coolant Temperature (ECT) sensor, and is placed in the right back side of the cylinder head on 2004 Audi A4 1.9 TDI. See picture below:

tdisline_201.jpg



Please do rate my response. Thanks!

Jan 30, 2011 | 2004 Audi A4

1 Answer

A4 misfire at 2000 rpm


The most likely cause is a failed mass air flow sensor and yes there is no code but if you look at the live data it will be obvious.

Jul 05, 2009 | 2004 Audi A4

4 Answers

My Audi A3 2.0 tdi limp mode/turbo overboost


i also have done a diagnostic test and it states a turbo overboost condition and it drives fine locally but loses power on the motorway and struggles to reach 80mph? any suggestions please email me at shiz86@hotmail.co.uk

Apr 21, 2009 | 2005 Audi A3

1 Answer

Idle fluctation


I would check for an AIR leak
DID you take of the Intercooler pipes ? 141 K you might have a PIN ***** in one or not seated correctly Mine were quite fragile so replaced them

Mar 24, 2009 | 2004 Audi A4

1 Answer

Hesitation on acceleration engine runs fine otherwise


My 99 Audi A4 2.8 Quattro was havinga problem starting at times. It would idle poor upon start and then it would come up in rpm where it should be. I had hesitation from a start and after coasting for more than 5-8 seconds, the car would shake violently upon acceleration at about 1/3 throttle. I cleaned the Mass Air Flow Sensor. This helped but did not solve all my problems. I then replaced the Mass Air Flor Sensor. Little to no change there ($108.00). Lastly, I replaced the spark plugs. I bought Bosch plugs ($4.82 ea.). This got rid of all the symptoms. I had bad lugs and possibily a dirty MAF!

Mar 19, 2009 | 2004 Audi A4

3 Answers

2002 volkswagon tdi lacks power


easy soloution ...disconnect the vacumn pipe going to the valve which sits on the inlet manifold and underneath it is a pipe which runs into the exhaust manifold.dont spray the water one as if you put too much water in you could hydraulic a piston and bend a con rod.either try removing the vac pipe if that doesnt work then remove the valve and block off the connection by making a gasket from a coke can but without the hole in the middle or fill the pipe up with an exhaust putty (gun gum) with a bit of tin foil on the exhaust side .promise you this will cure your problem cheaply .old vehicles never had none of this antipolution stuff on them and they ran ok.also you will still pass the emissions test for the anual inspection

Nov 05, 2008 | 2002 Volkswagen Jetta TDI

5 Answers

Lacks power


check the mass airflow sensor. When bad, there is reduced power and the computer uses a default setting

Nov 01, 2008 | 2002 Volkswagen Jetta TDI

2 Answers

Limp in mode


you have to change the solenoid control if your car is 3.5 engine the solenoid control located at inside the transmission..

Aug 19, 2008 | 2004 Dodge Intrepid

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