My tire shop had a hand held sensor that they placed near the sensor and found out it was front passenger sensor battery was dead.
Our style is sealed, he told me they have had some they took the sensors out and put a regular valve stem in and customer took home, broke them apart and changed the batteries, some reseal ed case back together, some don't, and when it was time to rotate the tires, they reinstalled sensors with new batteries.
The tire stores that give free lifetime rotation when buying tires from them, they know my tires have to be unmounted flipped and remount ed and balanced, when I go to that shop, I do not get charged.