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      03-10-2008, 08:42 AM   #8
IDBMW
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Drives: 135i
Join Date: Mar 2008
Location: Boise, ID

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I have a 2004 BMW Z4, most likely getting a 135i. The TPMS in the Z4 does not have sensors. It uses the ABS system for the tire pressure monitor. It works by pressing a calibration button and you drive off. When a wheel starts spinning faster than the calibrated setting compared to the other tires, the tire must be low on air and sets off the dash light. No additional hardware needed. Has the 2008 BMWs changed to the valve stem system? My 2006 Tacoma has the valve system TPMS. The truck went to the dealer ten times for TPMS failures. When they got it fixed I did the PVC pipe thing. I did keep the Spare tire TPMS sensor in it since it is hard to check the pressure in the spare tire.