Problems with the engine

Problem Possible causes/consequences and Solutions Solutions
The engine does not start. The starter motor can be heard. • There is a malfunction in the engine electronics.
• There is a malfunction in the fuel supply.
ignition back to position 0 or press the Start/Stop button repeatedly Before attempting to start the engine again, turn the SmartKey in the ignition back to position 0 or press the Start/Stop button repeatedly until all indicator lamps in the instrument cluster go out.
attempts to start the engine as these will drain the battery. Try to start the engine again. Avoid excessively long and frequent attempts to start the engine as these will drain the battery.
If the engine does not start after several attempts:
Mercedes-Benz Center. Consult a qualified specialist workshop, e.g. an authorized Mercedes-Benz Center.
The engine does not start. You cannot hear the starter motor. The on-board voltage is too low because the battery is too weak or discharged.
Jump-start the vehicle.
If the engine does not start despite attempts to jump-start it:
Mercedes-Benz Center. Consult a qualified specialist workshop, e.g. an authorized Mercedes-Benz Center.
The starter motor was exposed to a thermal load that was too high.
Allow the starter motor to cool down for approximately two minutes.
Try to start the engine again.
If the engine still does not start:
Mercedes-Benz Center. Consult a qualified specialist workshop, e.g. an authorized Mercedes-Benz Center.
Vehicles with a gasoline engine:
The engine is not running smoothly and is misfiring.		 There is a malfunction in the engine electronics or a mechanical component of the engine management system.
Only depress the accelerator pedal slightly.
workshop, e.g. an authorized Mercedes-Benz Center. Have the cause rectified immediately at a qualified specialist workshop, e.g. an authorized Mercedes-Benz Center.
Otherwise, non-combusted fuel may get into the catalytic converter and damage it.
The coolant temperature gauge shows a value above 248 °F (120 °C). The coolant level is too low. The coolant is too hot and the engine is no longer being cooled sufficiently.
down. Stop as soon as possible and allow the engine and the coolant to cool down.
add coolant if necessary. Check the coolant level. Observe the warning notes as you do so and add coolant if necessary.
    See also:

    Recovering a vehicle that has becomestuck
    Pull away smoothly, slowly, and in a straight line when pulling out a vehicle that has become stuck. Excessive tractive power could damage the vehicles. If the drive wheels have become stuck i ...

    Important safety notes
    In order for the battery to achieve the maximum possible service life, it must always be sufficiently charged. Have the battery checked regularly at a qualified specialist workshop, such a ...

    Problems with the windshield wipers
    The windshield wipers are obstructed Leaves or snow, for example, may be obstructing the windshield wiper movement. The wiper motor has been deactivated. ► For safety reasons, you should ...