The following jobs should always be carried out in the given 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 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 down.

Children and other persons 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 bonnetVolkswagen Touran Owners Manual. Fitting the removable ball coupling
Fig. 106 Overview: removable
ball coupling
Fig. 107 In the rear bumper:
removing the cover of the towing bracket.
First read and observe the introductory information
and safety warnings The removable ball coupling is located
in the vehicle tool kit in the luggage compartment either ...
Volkswagen Touran Service Manual. Run-Flat Tire PAX, Tire Inflation
When filling tires, pay special attention to the following
points:
After mounting the tires with inserted valve insert, fill
with air. At 1 bar (14.5 psi), check whether both beads are
seated correctly.
...