Sensors

A tire-pressure sensor is a small programmable electronic device, located in the pressurized pocket made by a wheel and tire, that constantly measures the air pressure inside the tire. The sensor transmits that information via low-frequency radio to the vehicle's onboard computer and, if the car has one, to a corresponding display in the instrument cluster. It reads out in pounds per square inch (psi), and it illuminates an amber warning light to alert you if one or more tires are low on air.