Quote:
Originally Posted by misslindseysue
The TPMS is ABS based. It takes some driving to set it so it can see a difference in the wheel speed = rolling diameter. So if you had a flat when you got in the car, it wouldn't have set right away - not until you drove a few miles at a fairly consistent speed.
Active TPMS (which is now required on new cars) would have told you that you have a flat right away, but that requires (expensive) sensors in each tire.
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MissLindsey is right again...
THere is direct and indirect tire pressure monitors. Unfortunately you will have indirect which calculates wheel speed differences of 12 psi or more. Direct actually has a sensor on the wheel that is pressure sensitive.