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

Solution

1. Preparation

• Tools Required: OBD-II scanner, smoke machine, basic hand tools, multimeter, torque wrench.
• Ensure the vehicle is parked on a level surface and the engine is cool before starting work.

2. Inspect and Replace Gas Cap

• Step 1: Remove the gas cap and visually inspect for cracks or damage.
• Step 2: If damaged, replace the gas cap with a new one that meets OEM specifications.
• Step 3: Reinstall the new gas cap and ensure it is tightened properly.

3. Smoke Test the EVAP System

• Step 1: Connect the smoke machine to the EVAP service port.
• Step 2: Activate the smoke machine and observe for smoke leaks.
• Step 3: Identify and repair any leaks found in hoses, connectors, or the EVAP canister.

4. Inspect and Test the Purge Valve

• Step 1: Locate the purge valve, which is typically near the intake manifold.
• Step 2: Disconnect the electrical connector from the purge valve.
• Step 3: Use a multimeter to check the resistance of the purge valve; compare it with the specifications in the service manual.
• Step 4: If the valve is faulty, replace it with a new one.

5. Clear Codes and Test Drive

• Step 1: Use the OBD-II scanner to clear the P0455 code.
• Step 2: Start the engine and let it idle for a few minutes.
• Step 3: Take the vehicle for a test drive to ensure the check engine light does not reappear.