Mercedes-Benz CLA 2020 Operator's Manual page 523

Warning/indicator lamp Possible causes/consequences and
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The yellow fuel reserve warning lamp lights up 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 you are driving.
*There has been pressure loss in the fuel system. The fuel filler cap is not closed correctly or the fuel system is leak‐
ing.
Fuel reserve warning lamp
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If the fuel filler cap has already been closed correctly:
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M M
Refuel.
Close the fuel filler cap.
Visit a qualified specialist workshop.
Display messages and warning/indicator lamps 521
Solutions