how to fix P0420 code in my Honda Pilot YF3 (2016-2022)?

Solution

1. Preparation

• Gather tools and parts required for the repair.
• Disconnect the battery to ensure safety while working on electrical components.

2. Oxygen Sensor Replacement (if needed)

• Tools Required: O2 sensor socket, ratchet, torque wrench
• Sub-steps:
  1. Locate the upstream and downstream oxygen sensors.
  2. Disconnect the electrical connectors from the sensors.
  3. Use the O2 sensor socket to remove the old sensor.
  4. Apply anti-seize compound to the threads of the new sensor.
  5. Install the new sensor by hand, then tighten to the manufacturer's specified torque (typically around 30 ft-lbs).
  6. Reconnect the electrical connectors.

3. Catalytic Converter Inspection or Replacement

• Tools Required: Socket set, jack stands, exhaust pipe cutter (if needed)
• Sub-steps:
  1. Inspect the catalytic converter for any signs of damage or blockages.
  2. If replacing, disconnect the exhaust pipes connected to the catalytic converter using a socket set.
  3. Remove any mounting bolts or brackets holding the converter in place.
  4. Install the new catalytic converter by reversing the removal steps, ensuring all connections are tight and secure.
  5. Use a torque wrench to tighten any bolts to the specified torque.

4. Clear the Code

• Reconnect the battery.
• Use the OBD-II scanner to clear the P0420 code and reset the check engine light.