One problem related to engine exhaust system has been reported for the 2006 Audi A4. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2006 Audi A4 based on all problems reported for the 2006 A4.
Car hesitated under acceleration at highway speeds resulting in total loss of power. Car continued to have acceleration and idling problems. Issues due to cam follower wearing prematurely causing major damage to high pressure fuel pump, intake and exhaust cams, damage to engine requiring total engine replacement.