These systems don’t use pressure sensors and therefore cannot display pressure. ![]() Indirect systems rely on the antilock brake systems to measure wheel speed and interpret the pressure. Some just alert of pressure loss with a warning light, but better systems provide a readout of the pressure in the tires. These systems, called direct TPMS, may require batteries that must be replaced after several years, often leading to replacing the entire sensor. Many wheels are fitted with sensors that monitor the pressure and send the data wirelessly to the car’s instrument panel. ![]() The federal requirement stipulates that the car be able to monitor the pressure and alert the driver when it drops significantly, but it does not specify the technology. ![]() Since their introduction, government studies have found that the systems have led to a significant reduction in underinflated tires on the road, benefiting fuel economy and safety. Tire pressure monitoring systems (TPMS) have been standard equipment in all new cars since model year 2008.
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