Mercedes-Benz S-Class 2019 Operator's Manual page 533

Warning/indicator lamp
Engine diagnosis warning
lamp
#
Electrical malfunction warn‐
ing lamp
8
Fuel reserve warning lamp
8
Fuel reserve warning lamp
Possible causes/consequences and
In some states, legal requirements stipulate that you must immediately consult a qualified specialist workshop as soon
as the yellow Check Engine warning lamp lights up.
Have the vehicle checked as soon as possible at a qualified specialist workshop.
#
The red electrical malfunction warning lamp is lit.
There is a malfunction in the electrics.
Observe the messages on the multifunction display.
#
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.
Close the fuel filler cap.
#
If the fuel filler cap has already been closed correctly:
Visit a qualified specialist workshop.
#
The yellow fuel reserve warning lamp is lit while the engine is running.
The fuel supply has dropped into the reserve range.
Refuel.
#
Display messages and warning/indicator lamps 531
M M Solutions