how to clear P0420 code on my Honda Pilot YF4 (2023-Present)

Solution

1. Preparation

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

2. Inspect and Replace Oxygen Sensors

• Tools Required: O2 sensor socket, ratchet, torque wrench
• Locate the upstream and downstream oxygen sensors in the exhaust system.
• Remove the connectors from both sensors.
• Using the O2 sensor socket, remove the upstream sensor first, followed by the downstream sensor.
• Install the new sensors by threading them in by hand to avoid cross-threading.
• Tighten to the manufacturer's specified torque value (usually around 30 ft-lbs).
• Reconnect the sensor connectors securely.

3. Inspect and Replace the Catalytic Converter

• Tools Required: Socket set, jack stands, exhaust pipe cutter (if needed)
• Raise the vehicle and secure it with jack stands.
• Locate the catalytic converter in the exhaust system.
• Inspect for any physical damage or signs of clogging.
• If necessary, remove the catalytic converter by unbolting it from the exhaust pipes.
• Install the new catalytic converter, ensuring proper alignment and sealing with any gaskets.
• Torque the bolts to the specified factory settings.

4. Clear the Codes

• Reconnect the negative battery terminal.
• Use the OBD-II scanner to clear the P0420 code from the engine control module (ECM).
• Start the vehicle and allow it to idle for a few minutes.