We don't have a lot of Audi A4 fuel system problems on file — feel free to add yours here. The most common A4 fuel system problems cost $1,100 to fix & occur at 97,000 miles. Click on a year below.

Worst Fuel System Problems
fuel pressure regulator failure 2007 Audi A4
fuel pump 2006 Audi A4
fuel injectors failed 2011 Audi A4