why is my Volkswagen Golf MK7 (2015-2019) throwing a P0455 code?

Solution

1. Preparation

• Gather tools: OBD-II scanner, multimeter, smoke machine, basic hand tools (socket set, screwdrivers).
• Ensure the vehicle is parked on a flat surface and the engine is off.
• Disconnect the negative battery terminal to prevent electrical shorts.

2. Inspect and Replace the Gas Cap

• Remove the gas cap and visually inspect for damage or wear.
• If damaged, replace with a new gas cap that meets OEM specifications.
• Reinstall the gas cap securely, ensuring it clicks into place.

3. Inspect and Replace EVAP Hoses

• Locate the EVAP hoses connected to the charcoal canister and fuel tank.
• Check for cracks or disconnections; replace any damaged hoses with new ones.
• Ensure all connections are secure and free of debris.

4. Smoke Test the EVAP System

• Connect the smoke machine to the EVAP service port.
• Introduce smoke into the system and observe for any leaks.
• If leaks are found, repair or replace the faulty components (e.g., hoses, canister).

5. Test the EVAP Purge Valve

• Locate the EVAP purge valve, which is typically found near the intake manifold.
• Disconnect the electrical connector and use a multimeter to check for resistance (should be within manufacturer specifications).
• If faulty, replace the EVAP purge valve.