Mercedes-Benz A-Class 2021 Operator's Manual page 386

384 Display messages and warning/indicator lamps
Warning/indicator lamp Possible causes/consequences and
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* The yellow coolant warning lamp is lit while the engine is running.
Possible causes:
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Coolant warning lamp (yel‐
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low)
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;
* The yellow Check Engine warning lamp is lit while the engine is running.
A malfunction has occurred in the engine, the exhaust system or the fuel system.
The emission limit values may be exceeded and the engine may be in emergency mode.
Engine diagnosis warning
In some states, legal requirements stipulate that you must immediately consult a qualified specialist workshop as
lamp
soon as the yellow Check Engine warning lamp lights up.
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* The red electrical fault warning lamp is lit.
There is a fault in the electrics.
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Electrical malfunction warn‐
ing lamp
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The temperature sensor is malfunctioning
The charge air, transmission oil or battery cooling is faulty
Avoiding high loads on the engine, drive to the nearest qualified specialist workshop.
Have the vehicle checked as soon as possible at a qualified specialist workshop.
Note the messages on the multifunction display.
Solutions