how to fix P0420 code in Honda Pilot YF4 (2023-Present)

Solution

1. Preparation

• Gather necessary tools and parts.
• Ensure the vehicle is parked on a flat surface and secure with wheel chocks.
• Disconnect the battery to prevent electrical shorts.

2. Inspect and Replace Oxygen Sensors

• Tools Required: O2 sensor socket, torque wrench, penetrating oil
• If any oxygen sensors are faulty, remove them using the O2 sensor socket, applying penetrating oil if necessary.
• Install new oxygen sensors, ensuring proper torque (typically 30-40 lb-ft) is applied.

3. Remove and Replace Catalytic Converter

• Tools Required: Socket set, torque wrench, exhaust hanger removal tool
• Remove any bolts securing the catalytic converter to the exhaust system using the socket set.
• Disconnect any exhaust hangers using the exhaust hanger removal tool.
• Carefully remove the catalytic converter from the vehicle.
• Install a new catalytic converter, ensuring proper alignment and secure it with bolts to the exhaust system.
• Torque the bolts to the manufacturer’s specifications (usually around 30-35 lb-ft).

4. Reconnect and Test

• Reconnect the battery.
• Clear the fault codes using the OBD-II scanner.
• Start the engine and allow it to reach the operating temperature.

5. Final Checks

• Tools Required: OBD-II scanner
• Re-scan the OBD-II system to ensure the P0420 code is cleared.
• Monitor the vehicle's performance during a test drive for any recurring symptoms.