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      01-03-2013, 03:56 PM   #4
MasterofGoing Faster
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Drives: 2012 E92 M3
Join Date: Dec 2012
Location: Southern California

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How is it that each tire has a TPM sensor yet BMW cannot display which tire it is that is going down? In my 2012 E92 M3, whenever 1 tire drops, the TPM indicator shows all 4 tires faulted. At first I was told by the dealer that this indicated a speed sensor failure. I later saw for myself that each tire has a sensor within so it must not depend on sensing wheel speed. Why then does the reset procedure require you to roll off before it re-calibrates? Is it using a wheel speed sensor or tire pressure sensor? Despite what the manual says, they included a single sheet manual addendum indicating to ignore the manual ... when there is a low tire, the indicator will display all 4 tires as being low. Is this a special feature only applicable to M3s and why?