Mercedes-Benz C-Class Saloon 2022 Owner's Manual page 551

548 Display messages and warning/indicator lamps
Warning/indicator lamp
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Coolant warning lamp (yel-
low)
;
Engine diagnostics warning
lamp
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Electrical fault warning lamp
Possible causes/consequences and
* The yellow coolant warning lamp is lit while the engine is running.
Possible causes:
The temperature sensor is malfunctioning
R
The charge air, transmission oil or battery cooling is faulty
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The radiator shutters are blocked or defective
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Avoiding high loads on the engine, drive to the nearest qualified specialist workshop.
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* 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 driver's display.
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Solutions
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