how to fix P0455 code in Volkswagen Passat B8 (2015-2022)

Solution

1. Preparation

• Gather necessary tools and parts.
• 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

• Sub-steps:
  1. Remove the gas cap and inspect the rubber seal for wear or damage.
  2. If damaged, replace the gas cap with a new OEM or quality aftermarket part.
  3. Reinstall the gas cap and ensure it clicks securely.

3. Check and Replace EVAP Hoses

• Sub-steps:
  1. Locate the EVAP hoses connected to the fuel tank, canister, and engine.
  2. Inspect each hose for cracks, pinholes, or disconnections.
  3. If any hose is found damaged, remove the faulty hose using a hose clamp tool.
  4. Replace with new hoses that are compatible with the Passat B8.
  5. Secure the new hoses with hose clamps.

4. Test and Replace EVAP Canister (if necessary)

• Sub-steps:
  1. Locate the EVAP canister typically found under the vehicle near the fuel tank.
  2. Inspect for physical damage or blockage.
  3. If damaged, disconnect the hoses and electrical connectors from the canister.
  4. Remove the canister using a socket wrench.
  5. Install the new canister, reconnect hoses and electrical connectors.

5. Check and Replace Purge and Vent Valves

• Sub-steps:
  1. Locate the purge valve (usually near the intake manifold) and the vent valve (near the canister).
  2. Disconnect the electrical connectors from both valves.
  3. Test the valves with a multimeter to ensure they function correctly.
  4. Remove any faulty valves using a socket wrench.
  5. Install new valves and reconnect electrical connections.