Mercedes-Benz A-Class Operator's Manual page 458

456 Display messages and warning/indicator lamps
Display messages Possible causes/consequences and
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* There has been pressure loss in the fuel system. The fuel filler cap is not closed correctly or the fuel system is
Gas Cap Loose
?
* The fan motor is defective.
leaking.
Close the fuel filler cap.
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If the fuel filler cap was already properly closed: consult a qualified specialist workshop.
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Avoiding high loads on the engine, drive to the nearest qualified specialist workshop. In doing so, ensure that
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the coolant temperature display remains below the red marking.
M M Solutions