Central locking issue

[DaveyRapier]

Im sure this has been covered on here before but I tried the search function and couldn't find the info I was after. Anyway the central locking in my '02 406 hdi is faulty. When I lock the car either off the key fob or doing it manually the car locks then instantly unlocks itself again, rather annoying tbh. Now someone suggested it may be a faulty solenoid in the lock, so set about trying to find which one. I disconnected the 2 rear door plugs one at a time and it was still happening so it must be one of the front doors (most likely drivers I would think)

What im asking is has anyone ever replaced a solenoid before? Is there a how to guide or anything knocking around? Also anyone provide part numbers? Any help appreciated....

[robb]

Before you start messing with the electrics spray some WD40 into the keyholes or take the door cards off and spray the locks a couple of us had this problem last year

[DaveyRapier]

Sorry should have mentioned all the locks have been checked none are sticking.