One problem related to battery has been reported for the 2003 Audi RS6. The most recently reported issues are listed below.
On star system warning lights illuminated. The consumer took the vehicle to the dealer and they installed different battery. It worked fine for a couple of months, then the warning lights came on again. It has happened five (5) times. The consumer took the vehicle to two(2) different dealers. Audi of rochester hills;45411 dequindre road; rochester hills, mi 48307; 248-997-7400.