One problem related to engine exhaust system has been reported for the 2010 Audi A4. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2010 Audi A4 based on all problems reported for the 2010 A4.
Fuel injector fails, car sputters, stalls. Smoke visible. Once fuel was seen exiting exhaust. Has occurred twice.