how to fix P0456 EVAP small leak code in Tesla Outback 5th Generation (2015-2019)

Learn how to diagnose and fix P0456 EVAP small leak in Subaru Outback 2015-2019. Step-by-step guide with diagnostic procedures and repair instructions.

Solution

1. Preparation

• Ensure the vehicle is parked on a level surface and the engine is off.
• Gather necessary tools and parts.
• Disconnect the battery to prevent any electrical issues.

2. Inspect and Replace Gas Cap

• Tools Required: None
• Inspect the gas cap for any visible damage or wear.
• If damaged, replace it with a new OEM gas cap.
• Reconnect the gas cap ensuring it clicks into place properly.

3. Inspect and Replace EVAP Hoses

• Tools Required: Pliers, socket set
• Remove any clips or fasteners securing the EVAP hoses.
• Carefully detach the hoses and inspect for cracks or breaks.
• Replace any damaged hoses with new ones according to specifications.
• Reattach the hoses securely and replace any clips.

4. Perform Smoke Test

• Tools Required: Smoke machine
• Connect the smoke machine to the EVAP system (typically at the service port).
• Activate the machine and observe for smoke escaping from any cracks or leaks.
• Identify and repair any leaks found.

5. Replace EVAP Canister (if necessary)

• Tools Required: Socket set, torque wrench
• Locate the EVAP canister, usually located under the vehicle near the fuel tank.
• Disconnect the electrical connector and remove the mounting bolts.
• Replace with a new canister, ensuring proper alignment.
• Reconnect the electrical connector and torque the mounting bolts to manufacturer specifications.

6. Test Purge and Vent Valves

• Tools Required: Multimeter
• Disconnect the electrical connectors from the purge and vent valves.
• Use a multimeter to check for resistance; compare readings with manufacturer specifications.
• If faulty, replace the valves with new components and reconnect electrical connectors.