In order to check whether the air pressure in the tyres is the correct pressure:

1. AYou must turn to an authorised tyre technician, since only he is permitted to check the air pressure in the tyres.
2. BYou check the pressure with an air pressure gauge.
3. CIt is enough to look at them and decide.
4. DYou must turn to an authorised garage, since only it is permitted to check the air pressure in the tyres.

Pick an answer to test yourself