My wife tells me that for the past couple of days the display by the speedo would either tell her "key fob battery low" or "no key detected" when she would start the car. So I changed the battery in the fob and it went away. Then I saw this video on youtube about the secret compartment in the new F250 that you can put the fob in to start the truck if the battery is dead. In my Focus ST it was in the spot where the key would have been, I have yet to find it in the Expedition. Anyone knows where it is?