Question about 2005 Audi A4
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.
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
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
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.
Posted on Aug 11, 2014
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Posted on Jan 02, 2017
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