Audi A6 owners have reported 1 problem related to differential unit (under the power train category). The most recently reported issues are listed below. Also please check out the statistics and reliability analysis of Audi A6 based on all problems reported for the A6.
The torsen part(s) in the awd system are defective thus causing a noticeable vibration at speeds of 40-80mph. The vibration can vary from significant to slight depending on ambient temp, vehicle/part temp, speed, acceleration profile, and length of time at cruise. Manufacturer is aware of the problem but will not acknowledge officially that it presents a safety hazard. It could ultimately lead to a catastrophic failure of the part at speed and subsequent loss of control at high speed.
See
all problems of the 2000 Audi A6
🔎.