How or where do you find the factory set entry code for a 2001 ford expedition?
Logic dictates that you go to the dealer and give him the vin# they should be able to help.
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On mine the control box for the keyless entry is up under the dash board, lay under the steering wheel and look to the very back and as close to the driver's side that you can, you will see it there. It will have 5 numbers on it, use these numbers for your keyless entry.