put key in ignition...turn to on position, turn off, turn to on position, turn off, turn to on position and keep there.(all within 5 seconds). Check engine light will start to flash. It will first flash the tens digit, then it will flash the ones digit, then it will hold for a few seconds, just put the number together(dont add) and then it will start to flash again. When if flashes 55, your done with the codes. Hopefully you can understand that :)