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 bonnetJoint-Free Wiper Blade Characteristics
Characteristics for Bosch and Federal Mogul
Check the manufacturer when replacing the wiper blades.
Always replace them with blades made by the same manufacturer.
The wiper blades can be identified by the wiper arm mount.
...
Extraction and Charging System Safety Regulations
Make sure the shut-off valves are closed before connecting
the charging system to the air conditioning system.
Make sure the process is finished before disconnecting the
charging system from the A/C system. This prevents any
refrig ...
Wheel, Balancing on Stationary Balancing Machine
Before beginning balancing, the following requirements must
be fulfilled.
The tire pressure must be OK.
The tire profile must not be worn on one side. The tire
profile must be at least 4 mm.
...