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 level surface and the engine is cool.
• Disconnect the battery to prevent electrical shorts during repairs.

2. Inspect and Replace Oxygen Sensors

• Tools Required: O2 sensor socket, ratchet, torque wrench.
• Sub-steps:
  1. Locate the pre-catalytic and post-catalytic oxygen sensors (generally found on the exhaust manifold and downstream of the catalytic converter).
  2. Unplug the electrical connectors of both oxygen sensors.
  3. Use the O2 sensor socket to remove the sensors from their respective locations.
  4. Install new oxygen sensors and torque them to manufacturer's specifications (typically around 30 ft-lbs).
  5. Reconnect the electrical connectors.

3. Inspect and Replace Catalytic Converter

• Tools Required: Socket set, ratchet, torque wrench, exhaust gasket.
• Sub-steps:
  1. Locate the catalytic converter in the exhaust system.
  2. Remove the bolts securing the catalytic converter to the exhaust system using the socket set.
  3. Carefully remove the catalytic converter and inspect the exhaust gasket for damage.
  4. Install the new catalytic converter with a new gasket.
  5. Torque the bolts to manufacturer's specifications (typically around 30-40 ft-lbs).

4. Reconnect Battery and Clear Codes

• Reconnect the battery terminals.
• Use the OBD-II scanner to clear the P0420 code from the vehicle's computer.