Awasome Audi A4 Check Engine Light Gas Cap Ideas. It seems like too much of a coincidence that the gas cap warning and cel would occur so close to each other and not be related. Web the check engine light on your audi a4 will usually shut itself off if the issue or code that caused it to turn on is fixed.
If the cap hasn't been tightened as much as it should be, tighten it all the way to see if the light goes off. Web mullardel34 · #2 · may 25, 2009 sea one said: It’s easy, and it’s free!
