Volkswagen Jetta rear driver's side door won't lock with key fob or manually, alarm activates when door is opened on Volkswagen Jetta

Some Volkswagen Jetta owners report experiencing issues with the rear driver's side door not locking with the key fob or manually, along with the alarm activating when the door is opened. These problems may stem from a faulty door lock actuator, as manually locking the door may not work. Additionally, some owners find that a dead key fob battery can prevent proper locking and unlocking of the doors. A faulty latch assembly is another common cause that may require inspection and potential replacement. Furthermore, debris or jammed mechanisms within the door lock can hinder proper locking, and using compressed air to clear out any debris might help. In certain cases, slamming the door can temporarily resolve the issue if the latch mechanism is stuck due to dirt or lack of lubrication. For persistent problems, a thorough inspection and professional assistance from a Volkswagen dealership or qualified mechanic are recommended to effectively diagnose and fix the issue.