Great information Guys. I bought my 2011 XLT out of town and realized when I got home I did not have the plastic code card with the owners manual. Called the dealer and he gave me to code over the phone and then mailed me the plastic card. He apologized for forgetting to give it to me. He said they take the cards out of the vehicles to keep people from stealing them.
Just bought a 2012 Navigator and this worked like a charm. I tried to use a mirror to look without unbolting the box, but I just couldn't make out the numbers. Gotta undo the one bolt, but worked like a charm.
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