2007+ Expedition & Navigator2007, 2008, 2009 and 2010 Ford Expedition and Lincoln Navigator
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See page 112 in the attached link and see if it will help. Replacing the battery should NOT lose fob programming, but you might be able to fix it by following these instructions from the user manual. Also make sure the battery is not in backwards. Don't ask me how I know.
The programming is in the vehicle module.
the fob simply sends a coded signal to the vehicle.
The vehicle compares the code to it's recognized list.
From the owners manual;
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.
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.
2001 E-350SD V10 Triton 3.73LS, ROTW 01/02/10
2008 F-150 FX2 Sport 5.4L 3.73LS Scab 145" Wb; '07 Taurus SEL
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