my Skoda Octavia NFL (2020-Present) has a check engine light on, how to diagnose?

Solution

1. Preparation

• Tools Required: OBD-II scanner, socket set, screwdrivers, inspection mirror.
• Ensure the vehicle is parked on a flat surface and the engine is turned off.

2. Retrieve and Analyze Codes

• Connect the OBD-II scanner to the vehicle’s diagnostic port.
• Turn on the ignition without starting the engine.
• Follow the scanner instructions to retrieve stored trouble codes.
• Note the codes for further analysis.

3. Inspect and Address Faulty Components

• Gas Cap:
  • If the code indicates an EVAP issue, inspect the gas cap.
  • Clean the cap and ensure it clicks into place securely.
• Air Filter:
  • Remove the air filter housing cover.
  • Inspect the air filter; replace if dirty or damaged.
• Vacuum Lines:
  • Visually inspect all vacuum hoses for cracks or disconnections.
  • Replace any damaged hoses.

4. Clear Codes and Test Drive

• Use the OBD-II scanner to clear the trouble codes after addressing the issues.
• Start the engine and allow it to reach operating temperature.
• Take the vehicle for a test drive to see if the check engine light comes back on.