How do you remove code on garage door selling car?

You remove the code from the vehicle by holding down (up technically) on the first and third buttons, simultaneously. Watch for the light to change from solid to flashing after 1 min.

However, in removing the code from the garage door opener mounted in the ceiling of the garage, you will need the original "clicker". With clicker in hand, you hold down on the setting button on the garage door receiver while also holding down on the "clicker" button. The garage door receiver light should flash several times to acknowledge the code. Test by using the clicker to open and close the garage door.

Yours- Sarah Lee aka Mycarlady