Question about 2005 Audi A4

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Malfunction Indicator Lamp(MIL) on and car shakes

This just happened as I was coming home. The MIL light goes on and the car starts to drive like ****. Also the speed warning(MPH) light goes on when I go like over 3k rpm. The car at idle it vibrates/shakes, like something is off. And when I accelerate it hesitates, almost like its going to shut off. Really don't want to a dealer because of the money. Was originally thinking it was the gas? But now wonder if it could be a spark plug or something.

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  • hihtaer Sep 30, 2008

    Its an 05, 1.8T, manual, and it is quattro. Has about 53000 miles I think. I will go to auto zone tomorrow...

  • hihtaer Oct 01, 2008

    I went to AutoZone today. And had a guy check it. He said it was 'fuel mixture'. He asked if I purchased gas recently. And I did, and was thinking it could be the gas. He said there seemed to be water in the gas. The gas attendant may have put regular, though my manual says its ok, though not preferred/recommended. He just told me to put some cleaner in, which I did and put another bottle on Friday. He said its probably the fuel injectors. The car is very sluggish, accelerates poorly, and the turbo I don't think its working. Because I don't hear the 'pssh' sounds.

  • hihtaer Oct 04, 2008

    Got the codes P0303 P0300 P0301

    Probable causes listed on the Autozone printout are; ignition system fault-spark plug(s), ignition wires, coil; Vacuum leak; Injector fault; high or low fuel pressure

  • hihtaer Oct 07, 2008

    I have also noticed a smell, might be from the exhaust. Getting very poor gas mileage. When I get to the higher RPM, the vibration is less apparent. But definitely lower and especially under 2, it really struggles and shakes like its going to shut off.

  • Anonymous Nov 13, 2008

    I have the same you think it is the converter?I too just put gas in.

  • tmoss54 Jan 25, 2009

    I have the same problem, car runs rough. It gets smoother as you increase speed. slight burning or exhaust oder when I parked. I had an 8 mile drive left when the MIL lamp started blinking. I filled up the tank earlier it was down to a range of 30 miles. I drove about 30 miles before it came on. It was very cold about 17 degrees. It is an A4 1.8 quartro. Any ideas?



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Sounds like your o2 sensors are screwed up. there are 2 o2 sensors on the 1.8t (one before the catalytic converter and one after). The computer on your car uses data from the sensors to adjust the fuel mixture for your car. It sounds like it's running too rich which can cause detonation inside the piston. This is VERY bad for your pistons. Take it in to the shop and get OEM o2 sensors. Don't buy anything aftermarket.

Posted on Mar 09, 2010

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First thing is to go to Auto Zone or Advance Auto Parts and ask them to scan the computer for fault codes (your check engine light is on, so you absolutely have at least one code in there). They'll do it for free, whereas a dealer will get you for an hour's labor. Do that and then post the code(s) you get up here as a reply to this question, and we'll take it from there. Also, when you reply, please list your engine, transmission, and whether the car is a quattro or not.

Posted on Sep 30, 2008

  • Jeremy Dellow
    Jeremy Dellow Sep 30, 2008

    OK, that helps. Certain parts on the 1.8T and 3.0 are causes for certain problems (the same part on each engine) but due to the differences in their design, there are parts on the 1.8T that could be an issue for a given failure, and those parts may not even exist on the 3.0. AutoZone will give you the proper codes, but their code definitions aren't always right (my 99 2.8 A4 had a fail code that they defined as a driveability failure of the cooling system, when it was actually a cam sensor failure). If you post the codes, I can define them for you and I'll try to help you narrow down your problem.

  • Jeremy Dellow
    Jeremy Dellow Oct 01, 2008

    If the turbo wasn't working, you'd definitely notice it. However, despite what the manual says, always run premium fuel on a high-tech, modern turbo engine. What was the actual code that came up on the scanner? That's what I need in order to help you - the "fuel mixture" fault could be one of about two dozen codes, indicating many different parts. I need the actual code to start narrowing down the fault. Not a bad move on injector cleaner anyhow, but the injectors are rare to fail on these cars - more common would be an O2 sensor, mass airflow sensor, intake air temp sensor, etc - there are just too many possibilities without the actual code.


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Thank you for the tip about the fuel mixture. I put $30.00 of 7-Eleven low grade gas in my vehicle yesterday, drove approximately 40 miles and then the MIL light came on solid and stayed on. After reading the post from StankyHanky, I decided to add an additional $20.00 of premium 76 gas and like magic, no MIL light. :) These Audi forums are so helpful, thank you.

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