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Audi a4 1.9 tdi 2001 wont read codes for diagnostics, wont rev when starting abs lights on and coil light starts flashing, changed egr valve and tested ecu no faults?

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6 Suggested Answers

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Posted on Jan 02, 2017

  • 225 Answers

SOURCE: 2005 Golf TDI Diesel - EGR "Emissions workshop" fault light

Hi, The EGR valve itself is on a set of flexible pipework - usually stainless steel - which runs between the inlet manifold and the exhaust manifold. The EGR actuator valve is pneumatically / vacuum operated by a solenoid valve, controlled by the ECU ( aka the brane). It's not usual for the EGR valve itself to fail, more likely the solenoid valve or its electrical connector getting dirty. If you google for VAG TDI N75 valve you should get all the info you could possibly ever need :-)

Hope this helps, D.

Posted on Jul 16, 2008

  • 3 Answers

SOURCE: audi a6 on board computer reading faults

you have a thermal fault i the abs modulator <ecu bolted onto pump> the rev counter fails because this signal fails to get from 13.8 volts to zero it only manages to get to about 3 volts this is very common on bosch 5 series mine had pt code bosch 0273004285 and is notorious but easil removed and sent to bba here in uk or others in usa you will have to remove wheel then washer bottle then modulator but car stiill drives when removed the esp needs signal from abs and fails at same time also loss of tacho signal puts il light on i tried to find second hand one biut they didnt work have sent mine for repair<you need a microscope to do it> will post when it comes back ps easily confirmed by spraying abs pump.modulator with freex=zer spray did it to mine and fault dissappears untill warm again nb even when cold i bet if you brake hard a couple of times it will fail please let me know if your pt number is same as mine and if this heelps it drove me nuts

Posted on Feb 26, 2009

  • 1 Answer

SOURCE: I got audi a6 2.8 lit. The engine misfires

I have a 1999 A6 2.8, and my car was doing the same thing. However, after spending about a $1,000.00 I took it to another dealership. they replaced the fuel filter, it was dirty from putting cheap 91 gas in the car. Once it was replaced the car ran like new. I had to replace it around 80,000 miles. Hope this helps

Posted on Jun 17, 2009

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SOURCE: 2001 audi allroad air suspension wont lower

I had the same problem, I went to my mechanic and they said that the system has shut itself off due to a problem the computer has seen, in my case it was a selinoid in the pump which released air had failed and had to be replaced, unfortonatly you can not buy the selinoid seperately and would have to replace the entire pump, I was lucky though because he has a spare pump that he pulled off another car which was blown but the selinoid was still good. It took them about 4 hours to find the problem but that was my experiance. DO NOT TAKE IT TO THE DEALER they will charge you for 4 new air bags and a new pump they quoted me almost 5000 Dollers and i got mine fixed for $500

Posted on Jun 20, 2009

  • 225 Answers

SOURCE: Audi a4 ABS light on

ensure the ecu connection is good the plug for those sometimes need a good amount of pressure to put on abs light i would check the sensors next to your brake caliper to ensure its not broken or disconnect it or if you dont feel like checking it buy new ones and replace them

Posted on Nov 03, 2009

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