One problem related to transmission noise has been reported for the 1999 Audi A6. The most recently reported issues are listed below.
Have had nothing but problems with the Audi A6 since inception. Car started making a horrible noise that sounds like it is coming from engine or transmission. Car cannot pass emissions. Engine smoking fluid is pouring out of front of transmission. The car dealer: nalley Audi in roswell, georgia. The car dealer nalley Audi fraudulently took money from me and never repaired vehicle.