P0457
1st Gear
Joined: Sep 2011
Posts: 288
3rd Gear
Joined: Jan 2010
Posts: 1,973
From: Costa Mesa, SoCal
It may help to use a specific Audi diagnostic tool such as VCDS / VAG-COM instead of a generic OBDII reader. Doing so may help to better pinpoint the fault code and whatever corrective measures are needed.