Tiny Mystery Leak
This bulletin applies to 2011 Audi A8 vehicles. The MIL may be on, with no leak found in the EVAP system, and a DTC P0456 (very small EVAP leak) stored in the ECM.
New software in the control module (J623) addresses the condition.
Reference the SVM table below to determine the appropriate SVM update code. If the existing software is already at the new version levels shown below, contact Audi technical assistance for further instruction.
Engine 4.2 FSI
Old software P/N 4H0907560A
Old software version 0006
New software P/N 4H0907560C
New software version 0004