how to troubleshoot P0456 code on Tesla Outback 4th Generation (2010-2014)

Learn how to troubleshoot and fix P0456 EVAP leak in 2010-2014 Subaru Outback. Step-by-step guide with diagnostic procedures and repair instructions.

Solution

1. Preparation

• Tools Required: OBD-II scanner, smoke machine, socket set, torque wrench, multimeter, safety goggles, gloves.
• Safety Warnings: Ensure the vehicle is on a level surface and the engine is cool before starting. Wear safety goggles and gloves to protect against gas fumes.

2. Replace Gas Cap (if faulty)

• Sub-steps:
  • Remove the existing gas cap by turning it counterclockwise.
  • Inspect the rubber seal for wear; if damaged, proceed to install a new gas cap.
  • Install the new gas cap by turning it clockwise until it clicks.

3. Repair or Replace EVAP System Components

• Sub-steps:
  • If the smoke test reveals a leak, identify the source (e.g., hoses, charcoal canister).
  • For hose replacement:
    • Disconnect the old hose from both ends.
    • Install the new hose, ensuring it is securely fastened with clamps.
  • For charcoal canister replacement:
    • Disconnect the electrical connector and hoses.
    • Unbolt the canister from its mounting location.
    • Install the new canister and reconnect hoses and electrical connectors.

4. Test Purge Valve

• Sub-steps:
  • Disconnect the purge valve from the EVAP system.
  • Use a multimeter to check for continuity across the valve terminals.
  • If defective, replace the purge valve with a new unit.

5. Clear Error Codes

• After repairs, use the OBD-II scanner to clear the P0456 code from the vehicle’s computer.