Mercedes-Benz GLS 2023, Operator'S Manual

Page: 492 / 538

Warning/indicator lamp Possible causes/consequences and
M
Solutions
;
Engine diagnosis warning
lamp
* 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.
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.
#
Electrical malfunction warn-
ing lamp
* The red electrical malfunction warning lamp is lit.
There is a malfunction in the electrics.
#
Note the messages on the instrument display.
8
Fuel reserve warning lamp
flashes
* 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 leaking.
#
Close the fuel filler cap.
If the fuel filler cap has already been closed correctly:
#
Visit a qualified specialist workshop.
490 Display messages and warning/indicator lamps