So, it doesn’t actually measure the pressure, it just tells you that a tire is low compared to your other three. If the computer decides a wheel spins faster, then it’s likely underinflated. The indirect system uses your car’s anti-lock brake or anti-slip sensors to determine if a wheel is spinning at a different rate than others, and then it compares that data. The two types of sensors for systems include direct and indirect. How do tire pressure sensors communicate? Sensata Technologies’ TPMS system uses Bluetooth to transmit data| Sensata The law also standardized the little yellow “flat tire” warning light you get in the dash, so that’s why your Toyota RAV4 has the same warning light as your neighbor’s Rolls Royce. It’s illegal for a repair shop to disable or tamper with a TPMS system. They must warn a driver when a tire is “significantly” under-inflated. In 2000, congress passed the TREAD Act which mandated TPMS systems in all passenger cars, SUVs and light trucks sold as of 2007. But how do these systems work on tires that are constantly rolling? Are TPMS systems required by law? A Tire Pressure Monitoring System light on the dashboard of a Lexus | Patrick Whittemore via Getty Images It certainly beats getting out and checking your tire pressure manually. They’re great because they show us, usually with a glance at the dash, the pressure in our tires and if they’re low or high. On our new cars and trucks, one of the most useful options is the TPMS or Tire Pressure Monitoring System.
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