Functional requirements
The system must have been initialized when the tire inflation pressure was correct; otherwise, reliable signaling of a flat tire is not ensured. Initialize the system after each correction of the tire inflation pressure and after every tire or wheel change.
See also:
Rear doors
Push the locking lever on the rear doors down.
The door can now be opened from the outside
only. ...
Tire inflation pressure values up to 100 mph/160 km/h
320i
328i
335i
...
Tire condition
Inspect your tires frequently for tread wear, signs of damage and for foreign
objects lodged in the tread. Check the tread depth.
Minimum tread depthThe tread depth should not drop below 0.12 in/3 ...