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.

Switch on the electronic parking brake 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_0 .

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 bonnetRemoving and installing trailer detector control unit -J345-
Note
When renewing the control unit, select
Renew function for the respective control unit in
Guided fault finding or
Guided functions mode
→ Vehicle
diagnostic tester.
Removing
â ...
Removing and installing rear 3-point seat belt, estate, with belt tensioner
Removing
WARNING
Observe safety instructions for pyrotechnic
components
→ Chapter.
Observe disposal regulations for p ...
Removing and installing hinges
Special tools and workshop equipment
required
Removing
Torque wrench -V.A.G 1331-
–
Lower moulded headliner in area of hinge mounting
...