Old 29 October 2008, 08:34 PM
  #2  
BLU
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Sounds to me as if the passenger lock mechanism is a bit sticky. When you lock the car with the plipper or on the drivers side it doesn't lock the passenger door (as its sticking) hence it unlocking the rest of the doors (cycling is the name for it!) When you lock it on the passenger side the mechanical force you produce when turning the key ovecomes this stickyness hence it locking ok. I would check and clean the passenger lock mechanism and see if that cures it