From Pop Mech...
Tire Pressure Warning System sensors are prone to damage when tires are being mounted or demounted, according to Toyota TSB PG010-05 Revised. The TSB suggests letting the sensor fall inside the tire by unscrewing the nut and washer from the stem when demounting, and indexing the valve stem away from the tire machine's mounting arm when mounting a new tire.
Tire Pressure Warning System sensors are prone to damage when tires are being mounted or demounted, according to Toyota TSB PG010-05 Revised. The TSB suggests letting the sensor fall inside the tire by unscrewing the nut and washer from the stem when demounting, and indexing the valve stem away from the tire machine's mounting arm when mounting a new tire.
