Emissions Maintenance Light: Description and Operation

Significance of Malfunction Indicator Lamp (MIL) for exhaust emissions
If the engine control module detects a malfunction it switches on the Malfunction Indicator Lamp (MIL).





Location MIL

Note: The MIL can switch on in the continuous or flashing mode. Check the DTC memory in every case:

Refer to Powertrain Management

^ Flashing mode: There is a malfunction present which can damage the catalytic converter when continuing to drive at this power output. If this occurs, continue driving only at reduced output.
^ Continuous mode: There is a malfunction present which causes the emissions to deteriorate. Check the Motronic engine control module and/or transmission control module.
^ Check the DTC memory if the customer has a complaint or if there is a driving characteristic problem and the MIL does not light up. This is because malfunctions can be stored which will not switch on the MIL immediately.

- Check function of Malfunction Indicator Lamp (MIL):
Refer to Powertrain Management