I thought all BMWs use the ABS starwheel to monitor tire pressure. When tire psi drops. rotation rate increases (in relation to other wheels), pulse rate from starwheel increases, low pressure light comes on.
You have sensors on the OE wheels???
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'03 X5 4.4 Sport, last of the M62s (8-03 build date)
I believe in deadication to craftmanship in a world of mediocrity!
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