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

Learn how to diagnose and fix P0456 code related to fuel system leaks in Subaru Outback 2015-2019. Step-by-step guide with tools and procedures.

Solution

1. Preparation

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

2. Inspect and Replace the Gas Cap

• Sub-steps:
  • Remove the gas cap and inspect the rubber gasket for wear or damage.
  • Clean the gas cap threads and the filler neck to ensure a good seal.
  • If the gas cap is damaged, replace it with a new OEM or quality aftermarket part.

3. Inspect EVAP Hoses and Connections

• Sub-steps:
  • Locate the EVAP hoses connected to the fuel tank and EVAP canister.
  • Visually inspect each hose for cracks, wear, or disconnections.
  • Replace any damaged hoses with new ones, ensuring proper fitment.

4. Check the EVAP Canister

• Sub-steps:
  • Locate the EVAP canister, usually found near the fuel tank.
  • Inspect for any signs of damage or blockage.
  • If damaged, remove the canister by disconnecting the mounting bolts and hoses.
  • Replace with a new EVAP canister (if necessary) and reconnect all components securely.

5. Conduct a Smoke Test

• Sub-steps:
  • Attach a smoke machine to the EVAP system to introduce smoke.
  • Observe for any smoke escaping from the hoses, connections, or canister, indicating a leak.
  • Seal any identified leaks with appropriate repairs or replacements.

6. Reconnect Battery and Clear Codes

• Sub-steps:
  • Reconnect the vehicle’s battery.
  • Use the OBD-II scanner to clear the P0456 code.
  • Start the engine and let it idle for a few minutes to ensure the system is functioning properly.

Tools Required:

• OBD-II scanner
• Socket set
• Smoke machine
• Fuel pressure gauge
• Screwdrivers

Parts Required:

• Gas cap (if necessary)
• EVAP hoses (if damaged)
• EVAP canister (if necessary)

Estimated Repair Time: 2-4 hours

Safety Warnings:

• Disconnect the battery before working on electrical systems.
• Allow the engine to cool before opening the fuel system.