How to reset air sensors?

In your owners manual there should be a section on "Relearning" the tire pressure moniters. Look in the index. It involves selecting relearn on the instrument panel and then starting in a certain wheel position and adding air or letting air out until the horn beeps, and then quickly go to the next wheel and do the same thing until the horn beeps, and soon until you do all 4 wheels. You need to follow the sequence spelled out in the manual so the sensors will "relearn" each sensors correct position so when it says Left Rear low, it means Left Rear and not right rear or some other position because someone did not "relearn" after rotating wheels or some other repair. And usually the spare tire does not have a sensor so if you put the spare on it will not read that wheel position. So look in the manual index and see what you find. It might be in the index under the heading of "Tires". Here is a sample of what it might read.TPMS Directions