05-20-2007, 09:49 AM
You will need 2 keys already programmed, some early expeditions you were able to use just one key but I believe that was 1997-1998 model years. Try to find the lost key, or do not lose the key you have. I not longer work for Ford and do not have access to the scanners, otherwise I would borrow one. Some locksmiths might have a scanner to program new keys, give that a try and it might be cheaper.