If your vehicle is showing dashboard displays an incorrect tire pressure reading, here are the most likely causes and the parts you'll need to fix each one.
TPMS sensors have internal batteries that typically last 5 to 10 years. When the battery dies or weakens, the sensor will send erratic, incorrect, or missing pressure readings to the dashboard.
The sensor may actually be reading correctly. A slow leak from a puncture, or a sudden drop in ambient temperature, will cause the actual tire pressure to drop and trigger the warning.
If you recently had your tires rotated or replaced, the system may not have been properly reset. The vehicle is reading the sensors in the wrong positions, displaying incorrect pressures for specific tires.
TPMS sensors are fragile and can easily be broken by tire mounting machines if the technician isn't careful during a tire change or flat repair.
Exposure to road salt, moisture, or the use of incorrect metal valve caps can corrode the TPMS valve stem, causing slow air leaks or internal sensor failure.
In rare cases, the computer module responsible for receiving the wireless signals from the TPMS sensors fails, causing incorrect or missing readings across multiple tires simultaneously.