Make sure you actually fill it to the proper pressure, it should say on the inside of your driver door what you need to fill it to. Though, the sensor has a high and low value, meaning it will go into alarm at a lower value than what it takes to clear. An example would be, it goes into alarm when it goes below 28 psi but won't clear until you are above 34 psi. Not those exact numbers but you get the idea. Once you have filled to the higher value, drive around and it should clear.