The most likely culprit is that the plastic retainer that holds the long metal rod that goes between the latch mechanism and the inside door handle has broken, and the rod is no longer connected....
Because of the safety purposes, if a car door is opened from the outside then anyone can open the door and the passengers will have no safety and privacy.
) Mona
Remove the inside door panel ( it's not as difficult as you may think) examine the lock and find the rods that connect the key part of the lock to the lock mechanism ( called the linkage) the linkage...