I hate TPMS. Can't anyone just check their tire pressure every week like people used to do? Good thing you don't own a Chrysler though, the TPMS valve stems in those break off all the time due to corrosion, and there is no separate part number for just the stem portion of the sensor, in fact they look like they can be disassembled for this purpose, because rarely does the sensor itself fail. There is an internal recall on the old style Chrysler TPMS valve stems, meaning they know it's a common problem but won't reimburse you for it. At about $140 for OEM valve stems/sensors that's pretty retarded.