how to fix P0455 EVAP leak on Tesla Outback 4th Generation (2010-2014)

Learn how to diagnose and fix P0455 EVAP leak in Subaru Outback (2010-2014). Step-by-step guide with diagnostic procedures and repair instructions.

Solution

1. Preparation

• Gather all necessary tools and parts.
• Park the vehicle on a level surface and engage the parking brake.
• Disconnect the negative battery terminal to prevent any electrical shorts.

2. Inspect and Replace Fuel Filler Cap

• Tools Required: None
• Check the condition of the fuel filler cap. If it is cracked or not sealing properly, replace it with a new cap.

3. Inspect and Replace EVAP Hoses

• Tools Required: Pliers, socket set
• Remove any clamps securing the EVAP hoses.
• Inspect hoses for cracks or damage; replace any defective hoses with new ones.
• Reattach hoses securely using clamps.

4. Perform Smoke Test

• Tools Required: Smoke machine
• Connect the smoke machine to the EVAP system test port.
• Activate the smoke machine and observe for smoke escaping from any leaks.
• Repair or replace any components identified with leaks (e.g., hoses, canister).

5. Replace Purge and Vent Valves (if necessary)

• Tools Required: Socket set, pliers
• Locate the purge valve and vent valve.
• Disconnect the electrical connectors and hoses from the valves.
• Remove the valves using the socket set and replace with new valves.
• Reconnect hoses and electrical connectors.

6. Reconnect Battery and Clear Codes

• Reconnect the negative battery terminal.
• Use the OBD-II scanner to clear the P0455 code.
• Start the vehicle and allow it to reach operating temperature.