Problems with the engine

Problem Possible causes/consequences and - 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.

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•►  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.

•►  Try to start the engine again (Y page 146). 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:

•►  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 (Y page 338).

If the engine does not start despite attempts to jump-start it:

•►  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:

•►  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.

•►  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.

•►  Stop as soon as possible and allow the engine and the coolant to cool down.

•►  Check the coolant level. Observe the warning notes as you do so and add coolant if necessary.
    See also:

    Important safety notes
    WARNING Ensure that the trunk lid/tailgate is closed when the engine is running and the vehicle is in motion. Among other dangers, deadly carbon monoxide (CO) may enter the vehicle interi ...

    BAS (Brake Assist System)
    Observe the "Important safety notes" section. BAS operates in emergency braking situations. If you depress the brake pedal quickly, BAS automatically boosts the braking force, thus s ...

    Using headphones
    Vehicles intended for sale in the USA are equipped with cordless headphones. Corded headphones are available for the Canadian and other markets. You can use the cordless headphones supplied a ...