how to fix P0420 code on Honda CR-V Sixth Generation (2023-present)

Solution

1. Preparation

• Gather tools and parts required for repair.
• Disconnect the negative battery terminal to prevent electrical shorts.
• Allow the exhaust system to cool down before beginning work.

2. Inspect and Replace Oxygen Sensors

• Tools Required: O2 sensor socket, torque wrench, penetrating oil
• Steps:
  1. Locate the upstream and downstream oxygen sensors.
  2. Use penetrating oil to loosen the sensor threads if they are rusted.
  3. Disconnect the electrical connector from each sensor.
  4. Remove the sensors using the O2 sensor socket.
  5. Install new sensors, ensuring to torque them to the manufacturer's specifications.
  6. Reconnect the electrical connectors securely.

3. Replace Catalytic Converter (if necessary)

• Tools Required: Socket set, wrench set, jack and jack stands
• Steps:
  1. Raise the vehicle using a jack and secure it with jack stands.
  2. Remove the exhaust heat shields if applicable.
  3. Unbolt the catalytic converter from the exhaust manifold and the exhaust pipe.
  4. Carefully remove the old catalytic converter.
  5. Install the new catalytic converter, ensuring proper alignment.
  6. Torque the bolts to the manufacturer's specifications.
  7. Reinstall any heat shields removed earlier.

4. Clear Codes

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