If your tire pressure light came on and you had all your tires at 32 lbs then there may be something else going on. The wheels don't have pressure sensors in them. Wheel sensors monitor the speed of each wheel's rotation and when the computer sees a discrepancy it will kick on the tire pressure light. As long as your tires are all about the same pressure the light won't come on. Only time I had my light come on is when I had a flat in one. I run mine about 32 lbs.