Read your owners manual. I think you push the gas pedal down 3 times within 15 seconds with the engine off and the key on.
Turn the key on [but DON'T start the engine]. Depress the gas pedal to the floor and release 3 times in a row. This must be done in less than 10 seconds. Your "change oil" light may now start flashing. Turn the key off for a few seconds. Turn the key back on. You should now be finished.
If I remember well you have to put your car on park, turn your key to start your electronics and pump the gas pedal 3 time.If I remember well you have to put your car on park, turn your key to start your electronics and pump the gas pedal 3 time.
What kind of car is it. If its a gm except Saturn, turn the key to the on position and push the gas pedal to the floor and let it all the way out 3 times with in ten seconds. Honda and Toyota hold the trip rest button turn the key to the on position and wait for it to go out. On Toyota the trip odo screen will have lines flashing 5 than 4 than 3 than 2 and so on, also may have to have trip a on screen first. Check your owners manual