hi recently brought a lovely 2000 model 270 cdi ml it came with two keys with no fobs and no buttons on the keys , the key unlocks all doors then when over a certain speed the doors all lock then when i park and open the drivers door they unlock i get out and use the key but it only locks the drivers door and there's no attempt to lock any other doors ie no motor or Central locking just the one door also there's no Central locking button inside which means to lock all doors i have to physically push down each individual lock button on each door then get out and lock the drivers door with the key , can someone please help me with a way to be able to lock all doors either from the key in the door or can i buy a fob for it ?

 

there should be a central lock button on the shifter area I think. its either there or below the radio on the dash. But you do have one.