Mercedes-Benz C-Class-Saloon 2020 Owner's Manual page 507

504 Display messages and warning/indicator lamps
Warning/indicator lamp
;
Engine diagnosis warning
lamp
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Electrical fault warning
lamp
Possible causes/consequences and
Make sure that the air supply to the radiator is not obstructed.
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Avoiding high loads on the engine, drive to the nearest qualified specialist workshop. In doing so, ensure that the
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coolant temperature display remains below 120°C.
* The yellow engine diagnostics warning lamp is lit while the engine is running.
A malfunction has occurred in the engine, the exhaust system or the fuel system.
The emissions limit value may have been exceeded and the engine may be running in emergency operation mode.
Have the vehicle checked as soon as possible at a qualified specialist workshop.
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Vehicles with a diesel engine: the fuel tank may have been run dry.
Start the engine three to four times after refuelling.
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If the yellow engine diagnosis warning lamp goes out, emergency operation mode is cancelled. The vehicle need
not be checked.
* The red electrical fault warning lamp is lit.
There is a fault in the electrics.
Note the messages on the multifunction display.
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M M Solutions
Internal use only