Hi all, the drives side door lock in my 2001 fiesta, doesn't like unlocking, it just feels like its locked solid. It'll lock fine, but wont unlock, so I have to use the passenger door. Am I safe to spray some WD40 in it? Also if this doesn't help, how hard is it to re-build/change? And will I need to go to ford for a new one (and no doubt get ripped off in the process)? It's got central locking by key not remote, if this changes anything.
Thanks, Sam.