how to diagnose P0455 code in my Volkswagen Golf MK7.5 (2020-Present)?

Solution

1. Preparation

• Gather tools and parts needed for the repair.
• Disconnect the vehicle's battery to ensure safety during repairs.

2. Inspect and Replace Fuel Cap

• Tools Required: None for inspection; replacement cap if needed.
• Inspect the fuel cap for damage. If damaged, replace it with an OEM part.
• Ensure the cap seals correctly when tightened.

3. Repair or Replace EVAP Hoses

• Tools Required: Pliers, socket set.
• Locate the EVAP hoses connected to the fuel tank and purge/vent valves.
• Check for cracks or disconnections; replace any damaged hoses with OEM parts.
• Ensure all connections are tight.

4. Perform Smoke Test

• Tools Required: Smoke machine.
• Attach the smoke machine to the EVAP system through the service port.
• Activate the machine and look for smoke escaping from any leaks in the system.
• Repair any identified leaks by replacing the defective components.

5. Test and Replace EVAP Components

• Tools Required: Multimeter, socket set.
• Check the EVAP purge valve and vent valve for proper operation using a multimeter.
• If either valve is faulty, replace it with an OEM part.
• Reconnect all components and ensure everything is secured.