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

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the negative battery terminal to ensure safety while working on the vehicle.

2. Inspect and Replace the Gas Cap

• Tools Required: None specifically for this step.
• Sub-steps:
  1. Remove the gas cap and inspect it for cracks or wear.
  2. Replace the gas cap with a new OEM or equivalent part if damaged.

3. Repair or Replace EVAP Hoses

• Tools Required: Pliers, hose clamps (if needed), and replacement hoses.
• Sub-steps:
  1. Identify any damaged hoses using visual inspection.
  2. Remove the damaged hoses using pliers and replace them with new hoses, ensuring tight connections with clamps.

4. Smoke Test the EVAP System

• Tools Required: Smoke machine.
• Sub-steps:
  1. Connect the smoke machine to the EVAP service port.
  2. Activate the smoke machine and observe for smoke escaping from any areas indicating a leak.
  3. Repair any leaks found by replacing or resealing components.

5. Check and Replace the Purge Valve

• Tools Required: Socket set and multimeter.
• Sub-steps:
  1. Locate the purge valve, usually found on or near the intake manifold.
  2. Disconnect electrical connector and hoses from the purge valve.
  3. Test the valve with a multimeter for continuity and replace it if it is faulty.
  4. Reinstall the new valve and reconnect all hoses and electrical connections.

6. Inspect and Replace the Charcoal Canister

• Tools Required: Socket set and possibly a torque wrench.
• Sub-steps:
  1. Remove the mounting bolts securing the charcoal canister.
  2. Disconnect the hoses and electrical connectors.
  3. Inspect for damage; replace with a new canister if necessary.
  4. Reinstall the canister, ensuring all connections are secure.