Mercedes-Benz S-Class Coupe 2018 Operator's Manual page 460

458 Display messages and warning/indicator lamps
Engine
Warning/indicator lamp
;
Engine diagnosis warning
lamp
#
Electrical malfunction warn‐
ing lamp
8
Fuel reserve warning lamp
Possible causes/consequences and
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 emissions limit value may have been exceeded and the engine may be running in emergency operation mode.
In some states, legal requirements stipulate that you must immediately consult a qualified specialist workshop as soon
as the yellow Check Engine warning lamp lights up.
Have the vehicle checked as soon as possible at a qualified specialist workshop.
#
The red electrical fault warning lamp is lit.
There is a fault in the electrics.
Observe the messages in the multifunction display.
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The yellow fuel reserve warning lamp lights up while driving.
There has been pressure loss in the fuel system. The fuel filler cap is not closed correctly or the fuel system is leaking.
Close the fuel filler cap.
#
If the fuel filler cap has already been closed correctly:
Visit a qualified specialist workshop.
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