Mercedes-Benz CLS Owner's Manual page 422

Warning/indicator lamp
ÿ
Coolant warning lamp (yel‐
low)
;
Engine diagnosis warning
lamp
Possible causes/consequences and
If the coolant temperature display is at the lower end of the temperature scale:
Consult a qualified specialist workshop.
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If the coolant temperature display is at the upper end of the temperature scale:
Exit the vehicle and keep a safe distance from it until the engine has cooled down.
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Check the coolant level (
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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 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
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.
M M Solutions
page 297).
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Display messages and warning/indicator lamps 419