tire pressure monitoring system
I've noticed that this is an option on new Rangers and other Ford vehicles, such as our '07 Mercury Mariner. How exactly does it work? Is it actually a sensor on each wheel/tire or a just another way of sensing different wheel speeds via the ABS sensors? The reason I ask is that my wife ran over a screw with the Mariner and the light came on indicating a low tire. It had only dropped to about 22 PSI and triggered it.