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Q: Bad tire pressure sensor

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The tire pressure sensor in the front left tire is not working.

Many tire pressure sensors that are located inside the vehicle tire assembly have a built in battery that does fail over time. Once the sensor does fail, it should be replaced with a new one. For tire pressure sensor assemlies that have an aluminum lock nut, this is a good time to replace the lock nut and seals on the other sensors or replace them all at the same time.

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