Mazda CX-9 2021 Manual page 421

The same tire pressure sensor is used

with the same wheel. Only the tire is
replaced.
A new tire pressure sensor is installed to

a new wheel.
NOTE
The tire pressure sensor ID signal code

must be registered when a new tire
pressure sensor is purchased. For
purchase of a tire pressure sensor and
registration of the tire pressure sensor
ID signal code, consult an Authorized
Mazda Dealer.
When reinstalling a previously removed

tire pressure sensor to a wheel, replace
the grommet (seal between valve body/
sensor and wheel) for the tire pressure
sensor.
Tire Pressure Monitoring System
When Driving
4-255