Mercedes-Benz S-Class 2020, Owner'S Manual

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Warning/indicator lamp
Possible causes/consequences and M M Solutions
;
Engine diagnosis warning
lamp
* 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.
Vehicles with a diesel engine: the fuel tank may have been run dry.
#
Start the engine three to four times after refuelling.
If the yellow engine diagnosis warning lamp goes out, emergency operation mode is cancelled. The vehicle need
not be checked.
#
Electrical fault warning
lamp
* The red electrical fault warning lamp is lit.
There is a fault in the electrics.
#
Note the messages on the driver's display.
8
Fuel reserve warning lamp
lights up
* The yellow fuel reserve warning lamp lights up while the engine is running.
The fuel supply has dropped into the reserve range.
#
Refuel.
568 Display messages and warning/indicator lamps