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      03-16-2011, 07:35 AM   #4
M4st3r_ITA
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Drives: BMW X3 f25 2.0d - ordered!
Join Date: Feb 2011
Location: Italy

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Quote:
Originally Posted by Babbage View Post
The new X3 doesn't use a sensor for TPM.

It uses the ABS system's wheel RPM monitor to detect flat tires. So any rim that fits onto the wheels should do, I think. Just be sure to recalibrate it in iDrive when you swap the tires.
Ok, but take a look to the user's manual, pag 82 and 83 http://dl.dropbox.com/u/169832/2011_...ith_iDrive.pdf :

"The system must have been reset when the inflation
pressure was correct; otherwise, reliable
signaling of a flat tire is not ensured. Always use
wheels with TPM electronics
to ensure that the
system will operate properly."

and

"The system does not operate correctly if it has
not been reset. For example, a flat tire may be
indicated despite correct tire inflation pressures.
The system is inactive and cannot indicate a flat
tire:
For a mounted wheel without TPM electronics.
▷ When the TPM is disturbed by other systems
or devices with the same radio frequency."
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