Mercedes-Benz C-Class Saloon Owner's Manual page 522

520 Display messages and warning/indicator lamps
Engine
Warning/indicator lamp
Possible causes/consequences 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.
Engine diagnosis warning
#
lamp
Vehicles with a diesel engine: the fuel tank may have been run dry.
#
#
The red electrical fault warning lamp is lit.
There is a fault in the electrics.
#
Electrical fault warning
lamp
8
The yellow fuel reserve warning lamp is lit while the engine is running.
The fuel supply has dropped into the reserve range.
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Fuel reserve warning lamp
Have the vehicle checked as soon as possible at a qualified specialist workshop.
Start the engine three to four times after refuelling.
If the yellow engine diagnostics warning lamp goes out, emergency operation mode is cancelled. The vehicle need
not be checked.
Observe the messages in the multifunction display.
Refuel.
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