how to fix P0455 large EVAP leak in Skoda Octavia NFL (2020-Present)

Learn how to diagnose and fix P0455 large EVAP leak in Skoda Octavia NFL. Step-by-step guide with diagnostic procedures and repair instructions.

Solution

1. Preparation

• Gather all necessary tools and parts.
• Ensure the vehicle is parked on a flat surface and the engine is off.
• Disconnect the battery to prevent any electrical issues.

2. Inspect and Replace Gas Cap

• Remove the gas cap and inspect for cracks or wear.
• If damaged, replace with a new gas cap.
• Ensure the new gas cap is properly tightened to create a seal.

3. Inspect EVAP Hoses and Connections

• Remove any covers obstructing access to the EVAP hoses.
• Check all hoses for cracks, leaks, or disconnections.
• Replace any damaged hoses with OEM or equivalent parts.
• Reconnect all hoses securely.

4. Test and Replace Purge and Vent Valves

• Locate the purge valve and vent valve; detach them from their connections.
• Use a multimeter to test the electrical connections for continuity.
• If either valve is faulty, replace them with new, compatible parts.
• Reattach the valves securely.

5. Smoke Test for Leaks

• Connect a smoke machine to the EVAP system.
• Introduce smoke while closely monitoring for leaks.
• If smoke escapes from any area, repair or replace the faulty component as necessary.

6. Reassemble and Clear Codes

• Reattach any covers or components removed during the inspection.
• Reconnect the battery.
• Use the OBD-II scanner to clear the P0455 code and any other related codes.