TPM not reliable

[jamesboags]

I have found on my car a 2007 X5 that the Runflat TPM is not at all reliable in fact downright flaky. I had a puncture in the tire and was running it until a new tire was available.. I checked pressure and it was at 19psi... the runflat monitor did not go off... I pumped up the tire and recalibarated and the same thing 2 days later , no alarm and 19psi... I'll be taking it to the dealer shortly to have it checked out but I can safely say that it is not to be relied upon to tell you.. I now do a visual check of tires evry now and then .. it would be much better if it was a pressure monitor rather than a basic revolution monitor.. I wonder if BMW will ever change that .. on a car that costs this $ it should be standard...