I had not used my 2001 reg ford focus key fob for about 3 years because battery died and when i put a new one in it didnt work so i tried this today and it worked im well pleased.
Key fob Programming for ford focus
1. Turn Ignition On/Off (II/0) 4 times within 6 seconds until a sound is made.
2. Press any button on Remote until a sound is made.
3. To program other Remotes, repeat after 2 seconds after the sound.
4. Turn Ignition On/Off to exit the programming.
5. A total of 4 remotes can be programmed.
david severn, February 2011