Volkswagen Golf MK5 (2004-2008) P0455 code how to fix EVAP leak

Solution

1. Preparation

• Tools Required: OBD-II scanner, socket set, multimeter, smoke machine, vacuum gauge.
• Ensure the vehicle is parked on a flat surface and the ignition is off.
• Disconnect the battery to prevent any electrical issues while working on the EVAP system.

2. Replace Gas Cap

• Sub-steps:
  1. Remove the existing gas cap by turning it counterclockwise.
  2. Inspect the sealing surface for debris; clean if necessary.
  3. Install a new gas cap and ensure it clicks securely into place.
• Parts Required: New gas cap.

3. Repair or Replace EVAP Hoses

• Sub-steps:
  1. Remove any underbody covers if necessary to access the EVAP hoses.
  2. Inspect hoses for cracks or damage; replace as needed.
  3. Use new clamps to secure the hoses if they were loosened.
• Parts Required: EVAP hoses (if damaged).

4. Replace Charcoal Canister (if necessary)

• Sub-steps:
  1. Disconnect the negative battery terminal.
  2. Remove the charcoal canister by unscrewing any bolts or clips securing it.
  3. Detach the hoses connected to the canister.
  4. Install the new charcoal canister and reconnect hoses.
  5. Reattach bolts or clips to secure the canister.
• Parts Required: New charcoal canister.

5. Test EVAP Purge and Vent Valves

• Sub-steps:
  1. Disconnect the electrical connectors from both valves.
  2. Use a multimeter to check for continuity; replace valves if faulty.
  3. Reconnect the valves and ensure they are securely fastened.
• Parts Required: EVAP purge valve and/or vent valve (if faulty).