Continuous MIL
WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 2003 Audi S8, 2003 Audi A8, 2002 Audi S8, 2002 Audi A8, and 2001 Audi A8. However, it is still accessible from the selected car via links, so may be relevant.
If the MIL lights continuously, there is malfunction that affects exhaust emissions. In this case the DTC memory of the ECM and TCM must be checked and the malfunction must be corrected as soon as possible.
Some malfunctions may occur without causing the MIL to come on. When driveability or performance problems are reported and there is no indication from the MIL, the operation of the MIL must be checked. In addition, the DTC memory of the ECM and TCM must be checked, as there may be malfunctions stored that do not switch the MIL on immediately.