Malfunction Indicator Lamp (MIL)

Malfunction Indicator Lamp (MIL), Significance

If malfunctions are recognized by the engine control module, they will be indicated by switching on the malfunction indicator lamp.

NOTE: The malfunction indicator lamp can be switched on in the flashing or permanently on mode. The DTC memory must be checked in every case
- Flashing: There is a malfunction which can cause damage to catalyst if driven in this condition. In this case the vehicle must not be driven using full performance!
- Permanently on: There is a malfunction which will increase exhaust emission. Check Motronic and/or automatic transmission control modules.
- If the malfunction indicator lamp does not light up, even though there is an engine running problem, or a customer has complained, the DTC memory must be checked, because malfunctions which do not switch the malfunction indicator lamp on immediately can also be stored.