The door lock mechanism on the front passenger door on my 200 S70 seems faulty. When I lock the car, the little up/down indicator up by the window goes down on all four doors, but only the drivers side and rear doors will lock. The front passenger door can be opened, even though the little stick thing on it is visibly down (sorry, I don't know the official name for that piece).<p>The physical lock mechanism on the inside of the door feels loose when I touch it, and I can push it into the "lock" position when I have the door ajar, but if I try to shut the door in this position it will not close because the metal locking bit gets in the way . I cannot get the mechanism into the lock position when the door is closed, but i can manually push it into locked/unlocked position when the door is ajar.<p><br>Any idea what could be going on? Is it an electrical/power lock problem, or is it merely a sticky lock? Any do-it-yourself suggestions I could try before I bring it into the shop?