My first thought is a bad battery. However, I have heard of cases where the
remote sometimes fail if you are near a strong radio signal (TV or radio
station or a radar transmitter).
You can also consult your Owner's Guide. Here are some excerpts:
If there is any potential remote keyless entry problem with your vehicle,
ensure ALL remote entry transmitters are brought to the dealership, to aid
Replacing the battery
The remote entry transmitter uses one coin type three-volt lithium battery
CR2032 or equivalent.
To replace the battery:
1. Twist a thin coin between the two halves of the remote entry transmitter
near the key ring. DO NOT TAKE THE RUBBER COVER AND CIRCUIT BOARD OFF THE
FRONT HOUSING OF THE REMOTE ENTRY TRANSMITTER.
2. Do not wipe off any grease on the battery terminals on the back surface
of the circuit board.
3. Remove the old battery. Note: Please refer to local regulations when
disposing of transmitter batteries.
4. Insert the new battery. Refer to the diagram inside the remote entry
transmitter for the correct orientation of the battery. Press the battery
down to ensure that the battery is fully seated in the battery housing
5. Snap the two halves back together.
Note: Replacement of the battery will not cause the remote transmitter to
become deprogrammed from your vehicle. The remote transmitter should operate
normally after battery replacement.
Replacing lost transmitters
If a remote transmitter has been lost and you would like to remove it from
the vehicle's memory, or you would like to purchase additional remote
transmitters and have them programmed to your vehicle:
. Take all your vehicle's transmitters to your dealer for programming, or
. Perform the programming procedure yourself.
Programming remote transmitters
It is necessary to have all (maximum of six - original and/or new) of your
remote transmitters available prior to beginning this procedure. If all
remote entry transmitters are not present during the programming procedure,
the transmitters that are not present during programming will no longer
operate the vehicle. Note: Do not press the brake pedal anytime during this
sequencing, as doing so will invalidate the procedure.
To program the transmitters yourself:
. Unlock all doors using the power door lock/unlock control. Insert a key
and turn the ignition from the 1 (OFF/LOCK) to the 3 (ON) position and cycle
between 1 (OFF/LOCK) and 3 (ON) eight times in rapid succession (within 10
seconds) with the eighth turn ending in the 3 (ON) position. The locks will
cycle to confirm that the programming mode has been entered.
. Within 20 seconds, program a remote transmitter by pressing any button on
a transmitter. The locks will cycle once to confirm that the remote
transmitter has been programmed. (If more than 20 seconds pass before
pressing a remote transmitter button, the programming mode will exit and the
procedure will have to be repeated.)
. Repeat the previous step to program additional remote transmitters. The
locks will cycle once to confirm that each remote transmitter has been
. When you have completed programming the remote transmitters, turn the
ignition to the 1 (OFF/LOCK) position or wait 20 seconds. Again the doors
will lock/unlock to confirm programming has been completed.
I suggest that you join the Expedition Owner's Mailing List. See
I say it could have been due to radio interference from another source. The
FOB transmits a code to the vehicle. If the code is garbled, the vehicle
won't recognize it. There was a discussion among members of the Expedition
Owner's List about this sometime back. I've never had it happen to me, but I
can see how it could happen.
Just a side note. A couple of years ago, it was in the local papers,
near the City of Bremerton, WA home of a Naval Shipyard many vehicle
remotes didn't work including mine. We thought it had something to do
with a particular ships arrival. This was further re-enforced when the
ship left, problems left with it, and reappeared when the ship came
back. I had to put my key fob against the extended on glass antenna to
open the car. Of course the Navy denied they had anything operating
that could cause this problem.
Address fake until the SPAM goes away ;-}
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