I'm not up to date with the latest cars but certainly on the cars that I have the tyre pressure monitoring system just monitors the rotations of the various wheels in relation to each other using the ABS sensors on each wheel and when it detects that one wheel is rotating faster it determines that the tyre must be losing pressure (due to the smaller rolling radius) and a warning light comes up in the cluster.
2001 Bora 4 Motion Sport now used by number two son
2011 Skoda Octavia Scout now with Underground Performance tune
2010 Jetta 125 tdi dsg for the misses - Impressed
2006 Polo GTI - Enhanced by some of Gav's magic - Absolutely loving it
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