If your vehicle is showing low tire pressure warning light is illuminated, here are the most likely causes and the parts you'll need to fix each one.
The most common reason for the light is an actual drop in tire pressure due to a puncture, seasonal temperature changes, or a slow bead leak.
TPMS sensors have internal batteries that typically last 7-10 years. When the battery dies, the sensor stops transmitting and triggers a system fault warning.
TPMS sensors are fragile and are frequently broken by tire mounting machines if the technician is not careful during a recent tire replacement or repair.
The valve stem that houses the sensor can corrode (especially metal stems in winter climates) or its rubber seals can degrade, causing a slow air leak right at the valve.
In rare cases, the vehicle's main computer module that receives the wireless tire pressure signals fails, causing the light to illuminate despite good sensors and proper tire pressure.