Mercedes-Benz S-Class Saloon W223 2021 Owner's Manual page 584

582 Display messages and warning/indicator lamps
Warning/indicator lamp
;
Engine diagnosis warning
lamp
p
Engine operating tempera-
ture warning lamp
#
Electrical fault warning lamp
Possible causes/consequences and
* The yellow engine diagnostics 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.
Have the vehicle checked as soon as possible at a qualified specialist workshop.
#
Vehicles with a diesel engine: the fuel tank may have been run dry.
Start the engine three to four times after refuelling.
#
If the yellow engine diagnosis warning lamp goes out, emergency operation mode is cancelled. The vehicle need not
be checked.
*Vehicles with a petrol engine: after a cold start, the blue reduced power output warning lamp is on.
The engine output and engine torque will remain reduced while this remains the case.
Take this into consideration in your driving style.
#
* The red electrical fault warning lamp is lit.
There is a fault in the electrics.
Note the messages on the driver's display.
#
Solutions
M
P223 0288 02