Question about 2004 Audi A4

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Miss fire and lean codes

I have a 2004 audi a4 quattro and im having p0301 p0302 p0303 p0304 and p0171 codes its also setting a turbo diverter valve problem it runs rough in park or neutral but in any other gear it runs smooth and stops missing also if i rev the rpms above 1500 it stops running rough but if its in park gear and running ok and i snap the pedal when the idle comes back sown to 800rpm it runs rough and engine light flashes i already installed new dealer coils and new ngk v power plugs and just today put 4 new dealer fuel injectors i dont know what else to do but i do know im seeing it lean on my fuel trim 25% very lean but i can locate a vaccum leak. any help email me mexicano66@gmail.com

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  • thunder_draj Apr 17, 2009

    i have

  • carlos molina Apr 17, 2009

    did you fix your problem yet?

  • ninja May 15, 2013

    what was wrong with it because im have the same problem with my audi as well

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Posted on Apr 17, 2009

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Posted on Jan 02, 2017

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SOURCE: 98 E-250 Rough Idle; codes p0156,p1131,p1151,p0301,p0171,p0174+

po301 thru po306 all misfire codes cylinder 1-6 remove plugs and replace them..... set the plug gap first
i suggest u replace the wires also if they never been replaced all these misfire codes can set the others and one is for the oxygen sensor ( 02s or HO2S) CIRCUT MALFUNCTION do u know how to check wireing systems
do the tune up plugs (set gap) .052-.056 change the fuel filter also. clear the codes hows it run
this info is for 98 E-250 4.2Litre
what engine do u have 4.2L or 4.6L i know it is a v-6 by the codes

Posted on Dec 15, 2008

dttech
  • 4803 Answers

SOURCE: p0136 p0156 p0401 p0402 p1131 p1151 p0171 p0174

All of that going on all at the same time is not likely at all. Are you sure the engine is actually overheating or is that just what your instrument panel is telling you?
With all of those things going on at the same time, here is what I would do. First I would take a REAL HARD look at the charging system. Goofy stuff like this is often caused by a battery with a shorted cell or an alternator with bad diodes that is feeding AC current into the computer network. The computers tend to do really goofy things when they are suffering from malnutrition.

Once I am satisfied that the charging system is in good condition, then I would clear the codes and go on a road test. If the check engine light comes back on, I would immediately scan the engine controller to find out which of the codes came back and fix it FIRST. Many times, fixing one code can fix ALL the codes. By doing it this way, you are more likely to find which one is your MAIN problem.

If your engine is actually overheating, all I can say is you need to diagnose your engine cooling system to find out why...all of the misfire codes could very likely be a result of the engine overheating and fixing the engine cooling system will most likely fix these codes.

Posted on Sep 28, 2011

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