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Tire Pressure Monitoring

Tire Pressure Monitoring

What is TPMS?

TPMS, Tire Pressure Monitoring System, is an electronic system that alerts you with a dashboard indicator light when your car's tire pressure falls to the point of needing inflation.

Why do cars have TPMS?

To help improve tire safety, congress passed a law that requires a percentage of 2006 and 2007 model year cars, and all 2008 model year cars, to be equipped with Tire Pressure Monitoring Systems.

How does TPMS work?

There are two different types of systems being used today: Direct TPMS and Indirect TPMS. Direct TPMS uses a sensor that's mounted in the wheel and measures air pressure in each tire. When air pressure drops 25% below the manufacturer's recommended level, the sensor transmits that information to your car's computer system and triggers your dashboard indicator light.

Indirect TPMS works with your car's Antilock Braking System's (ABS) wheel speed sensors. If a tire's pressure is low it will roll at a different wheel speed than the other tires. This information is detected by your car's computer system, which triggers the dashboard indicator light.

What should I do if my warning indicator comes on?

Check the air pressure in your tires and inflate any tire that is low according to the manufacturer's recommendation. When the tire is at the appropriate pressure, the indicator light should go off. If necessary, replace the tire with your spare tire and see your Firestone Complete Fleet Care store for needed repairs or replacement.