What does a tire pressure sensor involve? It is a device that monitors the air pressure in your tires. That means that drivers can’t drive unaware of underinflated tires as long as they have a tire pressure monitor installed in their vehicle. Everyday thousands of people drive with underinflated tires and have no idea, and before tire pressure monitors became mandatory in all vehicles made in 2008 and onward even more people did. So this is a great piece of technology because it helps reduce the amount of car accidents related to tire failures.