Malfunction Indicator Lamp (MIL) -K83- in instrument cluster

WARNING: This page is about a different car, the 2006 Audi A4, 2005 Audi A4, 2004 Audi A4, 2003 Audi A4, and 2002 Audi A4. However, it is still accessible from the selected car via links, so may be relevant.

If the engine control module (ECM) detects malfunctions which result in deterioration of exhaust emissions, these malfunctions will be indicated by illumination of exhaust gas warning lamp.

After switching on the ignition the ECM switches on the Malfunction Indicator Lamp (MIL) -K83-. Shortly after starting the engine, the MIL goes out if the ECM does not detect a malfunction through a deterioration of the exhaust emissions, and if the ECM activation of the lamp is ok.

If DTCs which cause the exhaust emission to deteriorate are detected when operating the engine, the ECM switches on the MIL. (These DTCs are listed in the DTC table). At the same time, an entry is made in the ECM DTC memory.

When switched on, the MIL may flash or illuminate constantly. In any case the DTC memory must be checked. Refer to Diagnostic Trouble Code (DTC) memory, checking

Continuous illumination

A malfunction is present which causes deterioration of the exhaust emission. Check DTC memory for ECM or automatic transmission (if available).

If there is a drive problem or a customer concern and the MIL is not illuminated the DTC memory must be checked. DTCs which do not switch on the MIL immediately, but only after recognizing the malfunction after restarting the engine, can also be stored.

Flashing

A malfunction is present which under these driving conditions will cause damage to the Three Way Catalytic Converter (TWC) (e.g. misfiring). In this case driving may only continue at reduced power.