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

Learn how to diagnose and fix P0455 large 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 set the parking brake.
• Disconnect the negative battery terminal to prevent electrical shorts.

2. Inspect and Replace Fuel Filler Cap

• Tools Required: None
• Remove the fuel filler cap and inspect for cracks or damage.
• If damaged, replace with a new OEM fuel filler cap. Ensure it is a proper fit.

3. Inspect and Replace EVAP Components

• Tools Required: Socket set, screwdrivers
• If any hoses, valves, or the EVAP canister are damaged or cracked:
  • Remove the damaged components by unscrewing or unclipping them from their mounts.
  • Install new components, ensuring they are securely connected and properly seated.
• Reconnect any vacuum hoses and ensure all clamps are tight.

4. Conduct a Smoke Test (if leaks were found)

• Tools Required: Smoke machine
• Connect the smoke machine to the EVAP system’s service port.
• Activate the machine and observe for smoke escaping, indicating a leak.
• Repair any identified leaks and ensure all connections are tight.

5. Reconnect Battery and Clear Codes

• Reconnect the negative battery terminal.
• Use the OBD-II scanner to clear the P0455 code and any other related codes.