Mercedes-Benz E-Class Coupe 2022 Owner's Manual page 441

438 Display messages and warning/indicator lamps
438
W W ar arning/indicat ning/indicator lamp or lamp
ÿ
Coolant warning lamp (yel-
low)
;
Engine diagnosis warning
lamp
Possible causes/conseq P ossible causes/consequences and uences 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 quali ed specialist workshop. In doing so, ensure that the
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coolant temperature display remains below 120°C.
* 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
R
The radiator shutters are blocked or defective
R
Avoiding high loads on the engine, drive to the nearest quali ed 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 quali ed specialist workshop.
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V V ehicles wit ehicles with a diesel engine: h a diesel engine: the fuel tank may have been run dry.
Start the engine three to four times a er 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.
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