We recently when adding air to a rear tire the valve Stem split so the following day had taken it to be repaired and had to replace the TPMS and right after that happened we drove about 250 kms the light came on 3 times and flashed then went out that happened 3 times then returning home drove 250 kms back home and it happened 3 times again. Could you give us some insight as to what is happening
It could have something to do with the way your new TPMS sensor operates and was reset after installation. You may need to have your tire shop reset the TPMS sensor again.
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Indirect TPMS systems do not use physical pressure sensors but rather measure the apparent air pressure by monitoring individual wheel rotational speeds. According to Chilton, an underinflated tire has a slightly smaller diameter than a correctly inflated tire and therefore rotates at higher revolutions per second to cover the same distance as a correctly inflated tire. The system functions in combination with anti-lock braking and electronic stability control system wheel speed sensors to identify when tires are spinning differently enough from each other to indicate under-inflation.
Indirect TPMS systems must typically be recalibrated after adding air to a low tire, after changing or servicing a tire, or after rotating the tires on a vehicle. This is usually done by pushing a reset button on the dashboard or through the onboard computer, and then driving the vehicle for a determined amount of time so the system can "learn" the correct rotational speed. If this is performed when any tire is in an underinflated condition, the system will not report correctly.