TPMS sensors have an internal battery with a limited service life that may range from five to seven years. Once the battery goes dead, the sensor needs to be replaced. Replacement is usually recommended when the tires are replaced. TPMS sensors also can be fouled by some types of tire sealer products.
A TPMS sensor’s ability to generate a good signal can be checked with a special TPMS tester that energizes the sensor and listens for a radio signal back from the sensor. If a sensor has failed or is not reading accurately, it needs to be replaced. “Universal” aftermarket TPMS sensors are available for a wide variety of applications. Following replacement, a special relearn procedure must be performed so the TPMS system can relearn the position of each sensor correctly.