Immobilizer

The immobilizer prevents your vehicle from being started without the correct SmartKey.

When leaving the vehicle, always take the SmartKey with you and lock the vehicle. The engine can be started by anyone with a valid SmartKey that is left inside the vehicle.

the SmartKey from the ignition lock. To activate with the SmartKey: remove the SmartKey from the ignition lock.
ignition off and open the driver's door. To activate with KEYLESS-GO: switch the ignition off and open the driver's door.
The immobilizer is always deactivated To deactivate: switch on the ignition.

when you start the engine. The immobilizer is always deactivated when you start the engine.

    See also:

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    Warranty
    The Service and Warranty Information booklet contains detailed information about the warranties covering your vehicle. Your authorized Mercedes-Benz Center will exchange or repair any defective par ...

    Unlocking the driver's door(mechanical key)
    If the vehicle can no longer be unlocked with the SmartKey, use the mechanical key. If you use the mechanical key to unlock and open the driver's door, the anti-theft alarm system will be trigge ...