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When you first start up the car after a cold night, you might see the TPMS symbol illuminate for a short time and then shut off. A 10-degree drop in ambient temperature results in the loss of about 1 psi, according to Tire Rack. When the weather is cold, the tire pressures drop. Temperature also can affect tire pressure and trigger your TPMS light. It could also mean that you are using a spare tire and the vehicle cannot detect the sensor of the original wheel. If the light is flashing, there could be a malfunction with the TPMS system.
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Only one may need air, but checking all of them is a good habit. When the TPMS light illuminates, you should check the pressure on all tires. These are all reasons to be vigilant about checking tire pressure at least monthly and to not rely on a TPMS to do the job. In addition to being a safety hazard, low tire pressure decreases fuel economy and causes tires to wear out more quickly. It's especially important to be vigilant about tire pressure when the weather is hot and vehicle speeds are high. It's much like bending a wire coat hanger: Bend it far enough and long enough, and it will heat up and snap. Excessive heat can break down components and chemical bonds inside a tire. An underinflated tire flexes more than a properly inflated tire, and that creates heat. A tire that's underinflated by just 5 psi can potentially fail. People who rely on the TPMS to warn them about low pressure are taking chances. Worse yet, roughly 10 percent admitted to ignoring the light altogether. Roughly the same percentage of those polled admitted to rarely checking the tire pressure.įor those who do recognize the TPMS light, 21 percent said that when they stop to check the low tire, they only give it a visual inspection rather than using a tire pressure gauge, the study said.
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A 2014 study by Schrader International, a company that manufactures TPMS systems, found that 42 percent of drivers are unable to identify the low tire-pressure warning light on the instrument cluster. But it's only effective if drivers can identify the light and are still vigilant about checking their tire pressures. In theory, a TPMS is a feature that helps drivers understand the safety of their cars.
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So here's the short version: Do not use the TPMS warning light as a substitute for regularly checking your tire pressure and keeping it at the recommended level. That's also well below the pressure required for safe driving, according to the American Automobile Association. Because of a variety of considerations from tire companies and automakers, a TPMS warning light isn't required to come on until a tire is 25 percent below the manufacturer's recommended tire pressure. The TPMS symbol is either a cross-section of a tire with an exclamation point in it or an overhead view of a car with all four tires exposed. Some 20 model-year vehicles also have TPMS. The feature is standard on all 2008 and newer models, thanks to the TREAD Act, which Congress enacted in 2000 after rollover incidents involving the Ford Explorer and Firestone tires. If you're buying or driving a 2008 or newer car, truck or SUV, it has a tire-pressure monitoring system (TPMS), which uses sensors to continuously monitor pressure in the tires and warn you with a dashboard symbol when tire pressure is dangerously low.