The following steps should always be carried out in the specified order before working in the engine compartment :

Park the vehicle on a level and stable surface.

Depress and hold the brake pedal until the engine has stopped.

Apply the handbrake firmly Braking, stopping and parking Brakes Parking .

Select the neutral position or move the selector lever to P Changing gear Changing gear Automatic gearbox see Automatic gearbox_0 Automatic gearbox see Changing gear_0 Automatic gearbox Manual gearbox see Changing gear_0 Manual gearbox .

Stop the engine and remove the key from the ignition Starting and stopping the engine Engine and ignition Ignition see Engine and ignition_6 .

Allow the engine to cool sufficiently.

Children and other people should be kept well away from the engine compartment.

Ensure that the vehicle cannot roll away unexpectedly.

WARNING
Preparing the vehicle for working in the engine compartment
Opening and closing the bonnetCorrosion Protection for Body, Attached and Welded Parts
Attachments
Coat the insides of the fenders, doors, covers and lids
completely. A spray application wet in wet procedure is
sufficient.
Before assembly, the seal the inside of the attachments with
cavit ...
General Information
Vehicles with a high voltage system (hybrid vehicles)
Observe all of the additional warnings for all work
performed on vehicles with the high voltage system. Refer to
→ Electrical Equipment; Rep. Gr.93.
...
Handling Pressure Vessels
Secure vessels to prevent them falling over!
Secure upright cylinders to stop them falling over and
cylinders lying flat to stop them rolling away.
Do not throw vessels!
If dropped, the vessels cou ...