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Originally Posted by CC 330i
The tire monitoring system just measures the speed that the wheel rotates. It's not on the wheel at all. When the system senses that a wheel is spinning at a different relative speed than the others, it will alert you. This will happen if the wheel loses air significantly due to a puncture. (mine never did alert me because it lost air so slowly, the system never caught it. I caught it by carefully monitoring tire pressures with a gauge).
After changing the pressure in one tire (after fixing a flat or low tire, for example) you can "re-calibrate" the system. You just drive for a few minutes on a straight road, and go into the menu on the computer and tell it to calibrate the tire monitoring system again. It then resets the sensor to the new diameter/speed of the wheel.
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Thanks for the info CC 330i!