You may have had your tires replaced at one point, or simply one tire repaired where the TPS was not reinstalled by the technician. Even with proper pressure in all four tires this light will stay on if not properly reset or reinstalled after maintenance.
When you put new tires on the car, did they put TPM monitors on, too. If not, then they did not check them. Go back to the facility that replaced the tires and have them fix problem. It was their over site and they should not charge you.
〉 Answered on Jul 12th, 2014 by Gail Dunn, Owner at Women's Automotive Connection
The sensors themselves may be bad if resetting the TPS system doesn't correct the issue. Check your manual on how to reset them. If that doesn't work, take it back to where you had the tires replaced to see if they can help you with it.
〉 Answered on Jul 12th, 2014 by Gelina Aquilina, Service Advisor / Mechanic at