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Servicing Motronic injection system
Exhaust warning lamp -K83 in dash panel insert
If the engine control unit detect faults which result in deterioration of exhaust emissions, these faults will be indicated by illumination of exhaust gas warning lamp.
After switching on the ignition the engine control unit switches on the EPC warning lamp. Shortly after starting the engine the exhaust warning lamp goes out if the engine control unit does not detect a fault through which the exhaust emissions deteriorate and if the actuation of the lamp is OK from the engine control unit.
If faults which cause the exhaust emission to deteriorate are detected when operating the engine the engine control unit switches on the exhaust warning lamp. (These faults are listed in the fault table). At the same time, an entry is made in the engine control unit fault memory.
When switched on, the exhaust gas warning lamp may flash or illuminate constantly. In any case the fault memory must be interrogated
Continuous illumination:
A fault is present which causes deterioration of the exhaust emission. Interrogate fault memory for Motronic-control unit or automatic gearbox (if available).
If there is a drive problem or a customer query and the exhaust warning lamp is not illuminated the fault memory must be interrogated. Faults which do not switch on the exhaust warning lamp immediately but only after recognising the fault after restarting the engine can also be stored.
Flashing:
A fault is present which under these driving conditions will cause damage to the catalytic converter (e.g. misfiring). In this case driving may only continue at reduced power.
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