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Originally Posted by marcx5
tire pressure monitors are nice, but another example of BMW being late in the technology game... they have been available on other cars for years. and even today, the BMW version only tells you when the pressure is low... when most other systems SHOW you the pressure PSI level so you can fill it up and keep them even as you choose. i don't understand why bmw doesn't display the actual pressure.
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That's because BMW doesn't mount anything inside their wheels. They just use the speed sensor from the ABS system to sense the possible flat. Under inflated tires rotate at a slightly different speed than fully inflated tires.