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WARNING - I'm guessing here but . . .
It is likely each TPMS Sensor has a unique identifier so your vehicle doesn't read another vehicle's sensor. According to others on this forum, there is a procedure that links specific sensors to your vehicle. The procedure isn't calibration, it is updating a list of electronic ID tags. Also according to others, your sensors must be 50 ft or more from the vehicle to keep them from being read by the vehicle. 50 ft is easily close enough for another vehicle's sensors to be read by yours, at least in a parking lot hence the need for some type of unique ID. Another guess is the sensors use some form of RFID to feed the under or over pressure indication back to the vehicle which means an ID could easily be incorporated or at least, a pairing key could be transmitted from the vehicle to the sensors.
Anyone actually know???
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