Why does your front passanger door not lock on your vw golf 1.9 2008 and when you open it the alarm goes off?

The issue with your front passenger door not locking and triggering the alarm when opened could be due to a faulty door lock actuator or a malfunctioning door latch mechanism. Additionally, a wiring problem or a faulty door sensor might also prevent the locking system from functioning properly. It's essential to check these components, as they can disrupt the central locking system and alarm functionality. Consider consulting a mechanic or a VW specialist for a thorough diagnosis and repair.