This happened on a 10 plate transit last year more than once.
Transit side door wont lock.
Info and repair ideas.
Issues in ford cars door locks and central lock system.
All doors are closed though.
Try opening the rear door driver side and operate the inside handle.
Sometimes when you press the unlock button on the keyfob to unlock the rear of the van only the back doors unlock.
Sliding door lock not opening.
I had to take out the lock to repair and decided to show whats happening when rotary knob gets stuck.
In my case i could have probably unhooked the yellow.
The side door stays locked.
The first thing to check is to make sure that any side door roller hasn t collapsed it is usually the middle roller that goes this results in the door dropping enough so that the contact pins for the locking motor that connect the wiring from the body to the door don t align any more.
How to get into a transit when the key will not work.
When you then try to lock the van by pressing the lock button it relocks the rear doors and beeps the horn to say a door not closed.