A TPMS sensor light on alert can be triggered for multiple reasons, including low inflation, sudden temperature changes, sensor battery depletion, or internal damage. When the light appears, the first step is checking the actual tire pressure with a handheld gauge. If pressure is correct, the issue may involve a sensor that has stopped transmitting properly. Driving with the light on for too long risks uneven wear or reduced safety during emergency braking. Ensuring the system is working correctly is essential for maintaining reliable tire monitoring and long-term vehicle stability.