When I use remote to lock or unlock the central locking all is ok, apart from the passenger side door.
This clicks quickly several times and the lock button goes up and down quickly and ends up sometimes locked, sometimes unlocked!!
All the other doors are fine but it's just this door. So I would suspect that it may be something to do with the mechanism??
Any ideas?

PeteH, April 2009

Its the door lock actuater i got a new one from mercedes garage for 55 POUNDS AND 30 POUNDS to fit it from a local garage not from mercedes . Its very hard to take the old one out and to fit a new one make sure you get a good mechanic.

saeed, January 2010