Mercedes-Benz S-Class Saloon 2021 Owner's Manual page 573

570 Display messages and warning/indicator lamps
570
W W ar arning/indicat ning/indicator lamp or lamp
;
Engine diagnosis warning
lamp
p
Engine operating tempera-
ture warning lamp
#
Electrical fault warning lamp
Possible causes/conseq P ossible causes/consequences and uences and
* 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.
*V V ehicles wit ehicles with a pe h a petr trol engine: ol engine: a er a cold start, the blue engine operating temperature warning lamp is on.
Engine output and engine torque are reduced.
Take this into consideration in your driving style.
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* 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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