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:

    Important safety notes
    WARNING Severe conditions (e.g. strong air pollution) may require replacement of the filter before its scheduled replacement interval. A clogged filter will reduce the air volume to the inter ...

    Activating/deactivating airrecirculation mode
    You can deactivate the flow of fresh air if unpleasant odors are entering the vehicle from outside. The air already inside the vehicle will then be recirculated. WARNING Fogged windows impair ...

    Position of the steering wheel for driving
    The steering wheel is moved to the last selected position when:  - the driver's door is closed.  - you insert the SmartKey into the ignition lock. or  - you press the Star ...