2004 Audi A6 Quattro Q&A
2004 Audi A6 Quattro Question: Engine is idling or racing a little loud after sitting about five hours or more!
Most likely you have a Check Engine light on Yes? Best to Check the codes and go from there. That way you will be tracing down the real problem and not guessing. http://repairpal.com/check-engine-light http://repairpal.com/directory?address=44146&car_brand_names=Audi - dandd