how to troubleshoot a P0455 code in Tesla Outback 5th Generation (2015-2019)

Learn how to troubleshoot and fix P0455 code in Subaru Outback (2015-2019). Step-by-step guide with diagnostic steps and repair instructions.

Solution

1. Preparation

• Gather necessary tools and parts.
• Ensure safety by parking the vehicle on a flat surface and setting the parking brake.
• Disconnect the negative battery terminal to prevent electrical shorts.

2. Inspect and Replace the Gas Cap

• Sub-steps:
  • Remove the gas cap and visually inspect the seal for cracks or debris.
  • If damaged, replace with an OEM gas cap.
  • Reinstall the gas cap and ensure it is tightened securely.

3. Inspect and Repair EVAP Hoses

• Sub-steps:
  • Locate all EVAP hoses connected to the fuel tank, EVAP canister, and purge valve.
  • Check for any signs of wear, cracks, or leaks.
  • Replace any damaged hoses with OEM parts, ensuring secure connections.

4. Test and Replace the EVAP Canister (if necessary)

• Sub-steps:
  • Remove the EVAP canister from its mounting location.
  • Inspect for physical damage or blockages.
  • If defective, replace with a new canister, following manufacturer specifications for installation.

5. Check and Replace Purge Valve

• Sub-steps:
  • Locate the purge valve; typically found near the intake manifold.
  • Disconnect the electrical connector and vacuum lines.
  • Test the valve using a multimeter for continuity and functionality.
  • Replace the purge valve if it fails the test.

6. Reconnect Battery and Clear Codes

• Sub-steps:
  • Reconnect the negative battery terminal.
  • Use the OBD-II scanner to clear the P0455 code.
  • Start the vehicle and let it run for a few minutes to ensure no reoccurrence of the code.