I have a 2007 Sonata V6. The TPMS light is on, but the tires are fine. Does anyone know what might be causing this? Any info. would be appreciated before I take it to the dealer. Thanks.

 

Even though the TPMS is not suppose to trigger an alert until a 25% drop in tire pressure from the recommended level, Hyundai has issued a TSB that indicates the TPMS system will trigger an alert with as little as a 10 to 15 percent drop in pressure (3 to 4 psi). Cold weather alone can cause this degree of pressure drop. You may not visually notice a full 25% drop in pressure with the side walls built into modern tires. Check the tire air pressure with a gauge and fill to the level specified on the B pillar label next to the driver.

http://www.hmaservice.com/files/331/5001871/08-SS-002-1%20PDF.pdf