Quote:

Originally Posted by gpburdell I don't believe the system senses discrete pressure, i.e. telling the car what PSI the car is at, but more that it communicates a deviation from the set-point. I could be wrong.

It's a little of both. The sensors do transmit pressure measurements; many other manufacturers display these readings on the instrument panel (BMW has decided we don't need/want to know... ). A TPMS reset does two things: Pairs the four transmitters' unique ID codes to the car and records the current pressure readings from each corner as the target pressures. The car computes the deviations thereafter.

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