my Skoda Octavia NFL (2020-Present) has a high-pitched whistling noise

Solution

1. Preparation

• Gather necessary tools and parts.
• Ensure the vehicle is parked on a level surface and the engine is cool.
• Disconnect the negative battery terminal to ensure safety.

2. Inspect and Replace Vacuum Hoses

• Sub-steps:
  1. Locate all vacuum hoses connected to the engine and intake manifold.
  2. Remove any damaged or cracked hoses.
  3. Replace with new hoses of the correct diameter and length, ensuring a snug fit.
• Tools Required: Pliers, hose cutter

3. Inspect and Replace Serpentine Belt

• Sub-steps:
  1. Release tension from the serpentine belt using a belt tensioner tool.
  2. Remove the old belt and inspect pulleys for wear.
  3. Install the new serpentine belt, ensuring it follows the correct routing.
  4. Reapply tension and check for proper alignment.
• Tools Required: Belt tensioner tool, socket set

4. Inspect and Repair Air Intake System

• Sub-steps:
  1. Remove the air intake duct to access the throttle body.
  2. Inspect the air filter and replace it if clogged.
  3. Check all connections and seals; replace any damaged components.
  4. Reattach the air intake duct securely.
• Tools Required: Screwdriver set, replacement air filter