Mitsubishi TPMS Light On Due to Low Tire Pressure

When the Tire Pressure Monitoring System (TPMS) warning light illuminates, the most common cause is one or more tires having significantly low air pressure. To confirm this, you will need an accurate tire pressure gauge.

1. Locate the tire pressure placard, usually found on the driver's side door jamb or in the owner's manual. This placard specifies the recommended cold tire inflation pressure for your vehicle's front and rear tires.
2. Using a reliable tire pressure gauge, check the pressure of all four tires, including the spare if applicable and accessible. Ensure the tires are 'cold,' meaning the vehicle has not been driven for at least three hours or more than a mile.
3. Compare the measured pressure of each tire to the recommended pressure on the placard. A tire is considered under-inflated if its pressure is 25% or more below the recommended level, or simply significantly lower than the others.