Tire pressure sensor
Sensor inside each wheel that warns of low pressure.
Signs it's worn: TPMS light stays on after the tires are filled.
What's wrong with my car? · Tires
Tire pressure light stays on with full tires?
Usually: Tire pressure sensor.
If the tire pressure light stays on with all tires filled correctly, a sensor's battery has likely died.
The parts that fix it
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This is a first read from the symptom, not a diagnosis of your car. If you're not sure, have a mechanic confirm before you buy, and bring the prices you found here with you.