my Volkswagen Passat B8 (2015-2022) makes a loud noise on startup

Solution

1. Preparation

• Gather necessary tools and parts.
• Ensure the vehicle is parked on a level surface.
• Disconnect the negative battery terminal to avoid electrical shocks.

2. Inspect Engine Oil

• Remove the dipstick and check oil level; top off if low.
• If oil is dirty or contaminated, perform an oil change.
  • Tools Required: Oil filter wrench, socket set, oil catch pan.
  • Safety Warnings: Allow engine to cool before opening the oil cap.

3. Check Battery and Starter Motor

• Reconnect the battery and test the starter motor using a multimeter to check voltage.
• If the starter motor is faulty, replace it.
  • Tools Required: Socket set, multimeter.
  • Safety Warnings: Ensure the vehicle is in park or neutral before testing.

4. Inspect Serpentine Belt and Pulleys

• Visually check the serpentine belt for cracks or wear; replace if necessary.
• Spin pulleys by hand to check for smooth operation; replace any that are noisy or stiff.
  • Tools Required: Wrench set, belt tensioner tool.
  • Safety Warnings: Be cautious of moving parts during inspection.

5. Examine Exhaust System

• Inspect the exhaust manifold and pipes for any loose components or leaks.
• Tighten any loose bolts or replace damaged parts.
  • Tools Required: Socket set, torque wrench.
  • Safety Warnings: Allow the exhaust to cool before touching.