Air Pressure light

[Ericss81]

Car 05 matrix xrs. The problem -I change one of my tires and since than air pressure light is on. I reset it all the time but it still comes back on! I took it back to Firestone, where I change the tire, but they said it not them may be the air pressure sistem has a problem and to take it to the dealer. Do I have air monitoring sistem in the valve or it is connected to the ABS as I was explained at Firestone?

[fishexpo101]

That would use the ABS system to determine if a tire is low on air or not. Make sure that all the tires are at the same pressure - check in the morning or at night, with no heat in the tires (make sure the car has not be run for several hours before you check). Try and make sure the pressures don't vary more than 1-2PSI max, the less variation the better.

Possible one of the ABS speed sensors got damaged, and that speed sensor is reported some nonsense numbers to the ABS ECM. Remove the wheel and note any damage (loose, cut, otherwise damaged ABS sensor wire) or damage to the sensor itself (just follow that wire).