how to fix the P0455 code on my Toyota Corolla E140 (2006-2013)

Learn how to diagnose and fix P0455 large leak in the fuel system of a 2006-2013 Toyota Corolla E140. Step-by-step guide with diagnostic procedures and repair instructions.

Solution

1. Preparation

• Gather tools and parts needed for repair.
• Disconnect the vehicle battery for safety.
• Ensure the vehicle is parked on a level surface with the engine off.

2. Inspect and Replace Gas Cap

• Tools Required: None
• Sub-steps:
  1. Remove the existing gas cap and inspect the rubber seal for cracks or debris.
  2. Clean the gas cap threads and the filler neck with a cloth.
  3. If damaged, replace the gas cap with a new one matching OEM specifications.

3. Inspect and Replace EVAP Hoses

• Tools Required: Hose clamp pliers, cutting tool
• Sub-steps:
  1. Locate the EVAP hoses connected to the fuel tank, charcoal canister, and purge valve.
  2. Check for cracks, loose connections, or signs of wear.
  3. If damaged, cut the old hose and replace it with new hoses that meet OEM specifications.
  4. Secure with hose clamps, ensuring tight connections.

4. Test and Replace Purge and Vent Valves

• Tools Required: Multimeter, socket set
• Sub-steps:
  1. Disconnect the electrical connectors from the purge and vent valves.
  2. Test the resistance of each valve using a multimeter; compare results with OEM specifications.
  3. If either valve is faulty, remove it using a socket set and replace it with a new part.
  4. Reconnect the electrical connectors.

5. Perform Smoke Test

• Tools Required: Smoke machine
• Sub-steps:
  1. Connect the smoke machine to the EVAP system through the service port.
  2. Activate the machine and observe for smoke leaks in the system.
  3. Identify and repair any leaks found during the test.

6. Clear Codes and Test Drive

• Tools Required: OBD-II scanner
• Sub-steps:
  1. Use the OBD-II scanner to clear the P0455 code from the vehicle's computer.
  2. Start the engine and allow it to reach operating temperature.
  3. Take the vehicle for a test drive to ensure the check engine light does not reappear.