I’m a used car dealer, and it’s something I often have to service on cars.
Inside the sensor you have a battery like those found in watches:
[https://res.utmel.com/Images/Article/91c38b71-e642-4b16-bd82-e49d04df1259.png](https://res.utmel.com/Images/Article/91c38b71-e642-4b16-bd82-e49d04df1259.png)
They die after a few years, and have to be replaced. This is often serviced when people buy new tires every few years.
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