Audi TSB #A391515 2028902-
2013 Audi A4
Affected Component: POWER TRAIN
- Supersedes Technical Service Bulletin Group 39 number 14-14 dated May 5, 2014. A squealing, howling, or whistling noise may be heard coming from under the vehicle. The condition is typically noticed when the vehicle is cold (normally below freezing) and is moving at speeds of 5 - 60 mph. The noise is from the intermediate bearing of the propeller shaft.