My central locking on the drivers door on my saff cos is playing up again (does this for a day or 2 then disapears for ages)

when i press the remote locking button on fob it tries to lock but automatically unlocks straight away ,and its really pissin me off

u can operate the passanger lock no probs tho manually ,even tho to activate the actual alarm u need to manually lock passenger door then activate alarm

Is this the actual door motor packing in i take it ,and if so how much to these cost ?????

little things like this really wind me up

cheers for info peeps