how to diagnose P0455 code on Ford F-150 12th Generation (2009-2014)

Solution

1. Preparation

• Tools Required: OBD-II scanner, basic hand tools (screwdriver set, socket set), smoke machine (if available).
• Disconnect the battery to ensure safety while working with electrical components.

2. Gas Cap Inspection and Replacement

1. Remove the gas cap and inspect the rubber gasket for cracks or deterioration.
2. If damaged, replace the gas cap with a new OEM or quality aftermarket part.
3. Reinstall the gas cap securely, ensuring it clicks.

3. Hose and Connection Repair

1. Inspect the EVAP hoses for cracks or disconnections.
2. Replace any damaged hoses with new ones, ensuring they fit securely.
3. Tighten any loose connections to prevent leaks.

4. Smoke Test Procedure

1. Connect the smoke machine to the EVAP service port.
2. Activate the smoke machine and observe for leaks; note any smoke escaping from cracks or loose fittings.
3. Address any identified leaks by replacing the faulty components (hoses, canister, etc.).

5. Purge Valve Testing and Replacement

1. Locate the EVAP purge valve, usually near the intake manifold.
2. Disconnect the electrical connector and apply power directly to the valve to test its operation.
3. If the valve does not activate, replace it with a new one.

6. Charcoal Canister Inspection and Replacement

1. Locate the charcoal canister, typically mounted near the fuel tank or rear axle.
2. Inspect for cracks or blockages; if damaged, remove and replace with a new canister.