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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.
 

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Just one! They suck! Lot of other manufacturers seem to use the same type of valve stem though, metal stem secured by a metal collar retaining nut. Another common way they break is from overtightening, spec is only 12 in lbs, or just enough to hold it in there, air pressure will hold it in anyways. But lots of techs reef them down like lug nuts... haha.
 

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For a long time the first GM's with TPMS used the speed sensors to function as TPMS, if one tire is inflated below the set threshold, the speed sensor for that corner (s) would sense the differential in wheel speed between the actual speed (an underinflated tire spins slightly faster than a properly inflated tire) and a set value in a computer, setting off the light once a set threshold was reached. Pretty decent system if you ask me, and it was cheaper to implement than the wireless infrared system that everyone else was starting to implement.

Reason nobody talks to you about a blinking TPMS light is because generally blinking means either you're running wheels with regular rubber valve stems or some other internal problem, which is usually beyond the scope of most lube places. Just an infrared TPMS tester tool probably costs a pretty penny.
 
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