Did you program it or have a shop do it (hopefully you didn't pay a shop to do it)? The last time I added a new remote, I had to reprogram the old ones as well. They were doing something similar - worked inside, and randomly worked outside. You might try programming all the remotes. If anyone has more knowledge please correct me if I'm wrong - if you have a sedan, your controller and antenna are near the driver's kick panel; a wagon's location is just forward of the spare tire (driver's side, just behind the rear wheel). Try bringing the remote outside and close to the respective location for your car's body style. See if it works closer up to the body. If that is the case or reprogramming doesn't solve it, replace the battery on the one giving you a problem. It might be new to you, but the battery may have sat in a warehouse for 5 years.
If you had someone else program it, it is a super simple process:
- Make sure all car doors are closed. Enter the car via the driver-side door, pressing the UNLOCK button inside the doorframe.
- In a 10-second span, turn the key in the ignition from OFF to RUN eight times. The last turn should leave the car on RUN.
- At this point, you should have entered programming mode, indicated by the door locks cycling between lock and unlock. If they do not, repeat step 2, turning the key faster.
- Once in programming mode, press any button on your Ford remote. This must be completed within eight seconds of the door locks beginning to cycle. They will cycle again to confirm your remote has been programmed and is now ready to use.
- Repeat step 4 for additional remote key fobs, as needed.
- When finished, turn the ignition to OFF. Your door locks MAY cycle again as another confirmation of programming completion.