Engine - CLA Coupé October 2023 C118 MBUX Owner's Manual

Warning/Indicator lampPossible causes/consequences and solutions
ÿCoolant warning lamp (red)

The red coolant warning lamp is lit while the engine is running.

    Possible causes:

If there is an additional warning tone, the coolant temperature has exceeded 120°C.


    If you open the bonnet in the event of an overheated engine or fire in the engine compartment, the following situations may occur:

Before opening the bonnet, allow the engine to cool down.
In the event of a fire in the engine compartment, keep the bonnet closed and call the fire service.

Stop immediately in accordance with the traffic conditions and switch off the vehicle. Do not continue driving.
Note the messages on the driver's display.

If the coolant temperature display is at the lower end of the temperature scale:

Consult a qualified specialist workshop.

If the coolant temperature display is at the upper end of the temperature scale:

Exit the vehicle and keep a safe distance from it until the engine has cooled down.
Check the coolant level (Checking the coolant level) .
Make sure that the air supply to the radiator is not obstructed.
Avoiding high loads on the engine, drive to the nearest qualified specialist workshop. In doing so, ensure that the coolant temperature display remains below 120°C.
ÿCoolant warning lamp (yellow)

The yellow coolant warning lamp is lit while the engine is running.

    Possible causes:

Avoiding high loads on the engine, drive to the nearest qualified specialist workshop.
;Engine diagnostics warning lamp

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.

#Electrical fault warning lamp

The red electrical fault warning lamp is lit.

There is a fault in the electrics.

Note the messages on the driver's display.
pEngine operating temperature warning lamp

The blue warning lamp for engine operating temperature will remain lit until the engine operating temperature has been reached.

The engine output and engine torque will remain reduced until then.

Take this into consideration in your driving style.
pEngine operating temperature warning lamp

Vehicles with a petrol engine:after a cold start, the blue engine operating temperature warning lamp is on.

Engine output and engine torque are reduced.

Take this into consideration in your driving style.
æFuel reserve warning lamp lights up

The yellow fuel reserve warning lamp lights up while the engine is running.

The fuel supply has dropped into the reserve range.

Refuel.
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