how to troubleshoot P0455 code in my Volkswagen Golf MK7 (2015-2019)

Solution

1. Preparation

• Gather tools and parts needed for the repair.
• Disconnect the battery to prevent electrical shorts during the repair.
• Allow the engine to cool before starting work.

2. Inspect and Replace Fuel Cap

• Tools Required: Torque wrench, socket set
• Inspect the fuel cap for cracks or damage.
• If damaged, replace it with an OEM or high-quality aftermarket cap.
• Tighten the new fuel cap until it clicks to ensure proper sealing.

3. Inspect EVAP Hoses and Components

• Tools Required: Pliers, screwdriver
• Remove any clamps securing the hoses, and disconnect the hoses from the EVAP canister and purge valve.
• Inspect the hoses for cracks, cuts, or loose connections. Replace any damaged hoses.
• Reattach the hoses securely and ensure that all connections are tight.

4. Replace Purge Valve or Vent Valve (if needed)

• Tools Required: Socket set, wrench set
• Locate the purge valve and vent valve.
• Disconnect the electrical connectors and remove the mounting bolts.
• Install the new purge or vent valve, ensuring proper orientation.
• Reconnect the electrical connectors and secure all mounting bolts to the manufacturer's torque specifications.

5. Smoke Test the EVAP System

• Tools Required: Smoke machine
• Connect the smoke machine to the EVAP system.
• Introduce smoke into the system and observe for any escaping smoke indicating leaks.
• If leaks are found, repair or replace the faulty components as necessary.

6. Clear Codes and Test Drive

• Tools Required: OBD-II scanner
• Use the OBD-II scanner to clear the P0455 code from the vehicle’s computer.
• Take the vehicle for a test drive to ensure the check engine light does not reappear and to verify the repair was successful.