The tires on your Mazda MX-5 help keep you rolling so you'll always be on the go. Tire pressure monitoring system (TPMS) in your Mazda works through sensors in your tires which will report real-time tire pressure. The system will alert you if the pressure inside your tires are lower than what is considered safe. This system helps keep you safe on the road, increases fuel economy (properly inflated tires leads to lower fuel consumption) and also helps you keep your tires maintained. Having a functioning sensor nut will allow for the TPMS to function properly.