Mercedes-Benz A-Class Operator's Manual page 484

482 Display messages and warning/indicator lamps
Engine
Warning/indicator lamp
Possible causes/consequences and
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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.
Engine diagnosis warning
In some states, legal requirements stipulate that you must immediately consult a qualified specialist workshop as soon
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as the yellow Check Engine warning lamp lights up.
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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
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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.
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Fuel reserve warning lamp
If the fuel filler cap has already been closed correctly:
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Have the vehicle checked as soon as possible at a qualified specialist workshop.
Refuel.
Close the fuel filler cap.
Visit a qualified specialist workshop.
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