Mercedes-Benz E CLASS 2020 Operator's Manual page 501

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 emission limit values may be exceeded and the engine may be in emergency mode.
Engine diagnosis warning
In some states, legal requirements stipulate that you must immediately consult a qualified specialist workshop as
lamp
soon as the yellow Check Engine warning lamp lights up.
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The red electrical malfunction warning lamp is lit.
* There is a malfunction in the electrics.
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Electrical malfunction warn‐
ing 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 leak‐
ing.
Fuel reserve warning lamp
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If the fuel filler cap has already been closed correctly:
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Avoiding high loads on the engine, drive to the nearest qualified specialist workshop. In doing so, ensure that the
coolant temperature display remains below the red area.
Have the vehicle checked as soon as possible at a qualified specialist workshop.
Observe the messages on the multifunction display.
Close the fuel filler cap.
Visit a qualified specialist workshop.
Display messages and warning/indicator lamps 499
Solutions