Tire Pressure Sensor Service Video

A tire pressure sensor sits inside each wheel and sends real-time air pressure readings to your vehicle's computer. When tire pressure drops below the manufacturer's recommended threshold, the system activates a dashboard warning light. This video shows where the tire pressure sensor is located on the valve stem and how it sends data to the receiver module. It also explains how a failed sensor can leave you driving on an underinflated tire without triggering a warning.

Most drivers assume the light means low air, but a failed sensor can trigger the same alert with all four tires perfectly inflated. Each tire pressure sensor contains a small battery, a pressure transducer, and a radio transmitter. The entire assembly is sealed to protect its components from the conditions inside the tire throughout the battery's lifespan.

Battery life typically runs 5 to 10 years depending on how often the vehicle is driven, since the sensor wakes and transmits only when the wheel is rotating. When the battery finally dies, the sensor cannot be recharged or opened, so replacement of the entire unit is the only fix.

A TPMS light that stays on after inflating your tires to the recommended pressure may indicate a failed sensor. If the light flashes for 60 to 90 seconds at startup before staying solid, it typically indicates a system malfunction rather than low tire pressure. Watch for corrosion around the valve stem base, as road salt used along Kingshighway and Route 74 during winter can damage the aluminum stem. Over time, corrosion can weaken the seal where the stem meets the sensor body, causing leaks before the battery fails.

If you are already scheduling a rotation, this is a good time to book a wheel alignment as well, since the tires come off either way.

At Parks Automotive, we scan each tire pressure sensor with a TPMS tool to identify battery, transducer, or valve stem problems. We then select a replacement sensor with the correct frequency for your vehicle and program its ID into the receiver module. Sensor work also falls under our broader suspension, steering, and wheel services so that a single visit can cover the sensor, a rotation, and a pressure check.

We install a new valve stem grommet and valve core with every sensor replacement to ensure a proper seal. Reusing corroded components can cause leaks and trigger the TPMS warning light again within a month. Programming matters on most vehicles built after 2008 because an unregistered sensor appears missing to the receiver, even when it transmits data correctly.

Call Parks Automotive at (573) 335-2599 to have the TPMS light diagnosed, or find your mechanic in Cape Girardeau online.