I mean it’s magic right? It’s gotta be magic. How would they even be powered? Or connected to anything? You’re telling me they just sit inside a tire and know shit and communicate it?
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The TPMS sensors have a tire pressure sensor. The sensor has a battery that will run out every few years. The car receives a signal that one of the tires is low — they often have to be pretty low for some sensors to catch it — and the system in the car displays the warning.
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