I have a 2011 mondeo titanium. Recently when I locked the car using the fob, all doors locked as normal apart from rear passenger door, this one actually sprung open. I even sat in car and tried to lock it manually but same thing happened. I have had to remove fuse for door so I can lock the rest of the car. Anyone had similar problems or any ideas of how to fix.
Thanx

 

Sounds like it could be a fault door looking mechanism.