What TPMS is and what it does for you. TPMS is an electronic system designed to monitor the pressure inside of your tires, the system normally consists of sensors in each of the wheels, a receiver, and a warning light or reading on the dash. The system will advise you if you have low pressure which can greatly save on fuel economy, but more importanly a low tire can cause your car to handle and stop substantialy different, which could cause accidents. TPMS or tire sensors were mandated by the US Government to be installed on all vehicles sold after September 1, 2007. But certainly makes and models had tire sensors as early as 1991.