[bityard]

Yes, they have a battery that lasts a few years. And typically, the battery alone cannot be changed, the whole unit must be replaced.

In my area, all franchised tire shops will refuse to install new tires on your car without also installing brand-new TPMS sensors, regardless of the age of the existing sensor. "Sorry, it's corporate policy."

[aequitas]

When I bring my bike to the tire shop for new tires the guy always cuts the nozzle off and places a new one in. Might just be a safety/liability thing. Since they're also made out of rubber, which degrades.