I have a 1998 1.6 Ford Focus, around 76k miles.

I can't lock the car from the drivers door anymore using the key. It feels like the key can't turn left as there is a lot of resistance. I can lock the car ok from the passenger side door using the key. I can still un-lock the car from the drivers door and then remote fob still works for both locking and un-locking all the doors.

Does anybody have any suggestions for what is causing the problem. I suspect the lock cylinder has worn out as the problem seems to be mechanical and isolated to how the key works in the lock. Electrically the locks work fine so I don't think there is anything wrong with the locking mechanism.

I'd appreciate peoples thoughts.

George