Originally Posted by wpoll

Verify which system you have - TPMS or FTM.

TPMS will have a pressure sensor and transmitter in each valve stem - they look rather different from a regular rubber and brass valve stem...



Note that parts A & B, along with the left end of part C are inside the wheel and not visible without removing the tire from the rim. NEVER undo part E unless you have the tire off the rim!

With FTM you will have the regular rubber and brass valve stem (although there are metal versions around).

If you have the FTM system, which uses wheel speed sensors to calculate tyre rotational speed differences, you won't get a response to queries on the TPMS module with INPA etc. as there is not one fitted.

If you have TPMS, then there maybe an issue with one or more of the sensors and further diagnostics is required. I think the batteries in the sensors are good for a quite a ling time but they can (and do) eventually go flat, requiring the sensor be replaced.