How do you reset the check engine light on a 2001 Ford Sporttrac?

When the light comes on you can check it with a OBD ii handheld scanner that you can purchase or go to your local auto parts store that will probably check it for free and tell you what the code is. However, most stores will NOT reset the computer because they cannot confirm that the repair was performed properly. Unless the OBDii code is cleared from the computer by the attached reader the code will keep reappearing, even if you disconnect the battery and try and reset it. If you use a mechanic then they will reset all codes after they perform the necessary repairs.