Global Mod Team
Join Date: Nov 2002
Location: Congleton - The centre of
I've had this when the locks have frozen. From that experience, my guess would be that you have a lock sticking for some reason. When you do it by hand, you have the strength to force it past that, but the central locking doesn't, so it ends up staying locked.
I'd start by getting some silicon spray and giving a liberal dose to the lock mechanism - both within the barrel (key hole) and on the end of the door. (Use silicon spray because it's a good lubricant, but will not rot any rubber parts.)
Then operate the lock a good few times to work it in, and see how you go on.
That's the cheapest possible solution, so I'd do that first. After that, it could be because a door has dropped maybe? Or a lock starting to break.
Oh, forgot to say, do this on both doors. From the description, I think it's likely the passenger door causing the issue, but it can't hurt to do both.
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