Ordinarily, the tire pressure light will require a manual reset once you've inflated your tires after driving with low air pressure for too long. This is caused by your car's TPMS sensor no longer being calibrated properly after that tire pressure differential. Resetting the tire pressure sensor light does vary from one car to another. Generally, the steps are familiar... First, you'll have to make sure that the tires are properly inflated at the recommended PSI. Then, you'll need to start up your car and press the TPMS reset button. After pressing and holding this button, the tire pressure sensor light will blink. At which point, go for a 30 or so minute drive at around 50mph. This should allow the TPMS sensor to properly re-calibrate themselves again.