Fascinating; I always thought they were attached to the inside of the rim, but googling "tire pressure sensor" shows that your mechanic is correct! Or rather, the original ones were on the rims but they've migrated to the inside of the stem.
I'm somewhat surprised they could have the failure mode you suggest, though It seems more likely that you've just gotten ice crystals in the valve stem, independent of the TPMS component.
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timeasmymeasure
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Date: 2014-02-09 04:22 pm (UTC)I'm somewhat surprised they could have the failure mode you suggest, though It seems more likely that you've just gotten ice crystals in the valve stem, independent of the TPMS component.