Functional check:

WARNING: This page is about a different car, the 2003 Audi S6 and 2002 Audi S6. However, it is still accessible from the selected car via links, so may be relevant.

Switch on ignition

The malfunction indicator lamp (MIL) -K83- must illuminate.

If malfunction indicator lamp (MIL) -K83 - does not illuminate, check DTC memory. See DIAGNOSTIC TROUBLE CODE (DTC) MEMORY, CHECKING AND ERASING .