Elite Auto Repair

Tempe Auto Repair: What Is A Tire Pressure Monitoring System?


All new cars and light trucks, since 2008, have come equipped with a tire pressure monitoring system. The TPMS system detects when a tire becomes under-inflated and lights up a warning light on the dash. So what’s the big deal? Well, under-inflated tires can be a real safety concern. First of all, they don’t handle properly, and that can lead to an accident. And second, under-inflated tires can overheat and cause the tire to come apart, which can also lead to an accident.

Government regulations requiring TPMS systems aim to reduce accidents and save lives, a very worthy goal. There are also positive environmental effects, because under-inflated tires are fuel wasters. You lose one percent of your fuel economy for every three pounds of pressure below ideal. So, proper tire inflation can save you a tank of gas a year. And, your tires last longer, so you won’t have to replace them as often. There are two kinds of TPMS systems. Direct systems have a battery-powered sensor in each wheel that measures tire pressure. The sensor sends a signal to a receiver that illuminates the warning light if pressure is low on a tire. Indirect systems use a computer program to detect under inflation, by measuring wheel rotation speeds and other data. You’ll have to replace TPMS parts as they wear out. Obviously, the batteries and the sensors will die someday. Road salt and grime can damage sensors, too. The system needs to be reset when you rotate or change your tires. Because the TPMS system is so important to your safety, you should make the necessary repairs when needed, and remember, TPMS is no substitute for regularly checking your tire pressure at least once a month. If you have any questions or concerns regarding your TPMS system, give us a call today.


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