You need to visit the Ford Truck forums to learn how to reset tire sensors. After completing the steps, just take this tool and go to each hoop, press the button and you will hear a small beep. I asked the local tire shop to install new sensors and they were never able to reset them. They ended up giving me the sensors for free and I reset them myself using this tool. Also suitable for changing tires. Do not leave the battery inside. The new 9V burned out overnight.