* A malfunctioning door handle: The door handle may be broken or damaged, preventing it from engaging properly with the door latch.
* A jammed door latch: The door latch may be stuck or jammed, preventing it from releasing when the door handle is pulled.
* A broken or damaged door lock: The door lock may be broken or damaged, preventing it from unlocking when the key is turned.
* A problem with the door cable or linkage: The door cable or linkage may be broken or disconnected, preventing the door handle from engaging with the door latch.
If you are unable to open the passenger door of your VW Passat from the inside, it is important to take it to a qualified mechanic to have it diagnosed and repaired.
