From what I recall ,(not sure it still applies on newer Fords) providing the max allowable # of programmed keys has not been reached yet, If you have 2 programmed PATS keys with you that start the car and have a newly cut correct PATS key that has not been programmed yet. You do not need a scanner and have to wait 10 minutes to gain security access in order to add an additional key you want programmed. You take the 2 programmed keys and insert in the ignition turn the key on, engine off ,till the theft light goes out , then within 2 seconds turn off ignition, remove the key and install the 2nd programmed key ,turn key on engine off, wait till the theft light goes out , then within 2 seconds install the un-programmed key and turn key on and wait till the theft light goes out and the car should then start and the 3rd key has been added.