One problem related to fuel injector has been reported for the 1999 Audi A6. The most recently reported issues are listed below.
Engine malfunction. The consumers wife was driving the vehicle when it suddenly began to race, she was unable to stop the vehicle. The consumer ran stop signs and an intersection until she finally turned the vehicle off. The vehicle continued to race, and due to the level of racing, the crankcase seal blew out which caused oil to flow. The dealer advised the consumer the problem was due to a stuck fuel injector. Scc.