Probably not what anyone was thinking but I got the dreaded TPMS INACTIVE warning tonight. The manual states that it could rectify itself. It also states it could be due to some signal interference and as I said rectify itself. In any event it says to get the system checked, which I will. I checked all tire pressures and they were SPOT ON which was surprising considering how chilly its gotten. None of this is a big deal but interesting nevertheless.
All of this brings me to an interesting question. Does the TPMS in our M3's indicate which tire is loosing pressure? There is an illustration in the manual that hints it might. My 2008 328i would make you guess which tire was loosing air. Please feel free to chastise for missing this in the manual and not searching.
Thanks guys.