how to fix the P0456 code on a Volkswagen Golf MK7 (2015-2019)

Solution

1. Preparation

• Gather all required tools and parts.
• Ensure the vehicle is parked on a level surface with the engine off.
• Disconnect the battery (negative terminal) to avoid electrical shorts.

2. Inspect and Replace the Gas Cap

• Remove the gas cap and inspect for any signs of wear or damage.
• If damaged, replace with a new gas cap that meets OEM specifications.
• Reinstall the new gas cap securely to ensure proper sealing.

3. Check and Replace EVAP Hoses

• Visually inspect all EVAP hoses for cracks, breaks, or loose connections.
• If any hoses are damaged, remove the old hoses using a hose clamp remover and replace them with new hoses.
• Ensure all connections are tight and secure.

4. Smoke Test the EVAP System

• Attach the smoke machine to the EVAP service port.
• Activate the smoke machine and observe for smoke escaping from any location in the EVAP system.
• If leaks are found, replace the damaged components such as the purge valve, vent valve, or connectors.

5. Reset the ECU

• After repairs are made, reconnect the battery.
• Use the OBD-II scanner to clear the P0456 code from the system.
• Start the engine and allow it to reach operating temperature.