Tire pressure sensors

[CTScott]

Originally Posted by auxmike

Does the sensor constantly transmit, or is wheel rotation required to energize it?

It transmits intermittently at a regular interval, but it transmits more frequently when it sees a problem (like no pressure), so having ones outside of the tires kills the battery quicker. When they are new they are shipped in a sleep mode (to maintain the shelf life), and once installed they are brought out of that mode.