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

Solution

1. Preparation

• Gather tools and parts required for the repair.
• Make sure the vehicle is parked on a level surface and the engine is cool.
• Disconnect the negative battery terminal to prevent electrical shorts.

2. Inspect and Replace Oxygen Sensors

• Tools Required: O2 sensor socket, wrench set, multimeter.
• Sub-steps:
  1. Locate the upstream (pre-catalytic) and downstream (post-catalytic) oxygen sensors.
  2. Unplug the electrical connectors for both sensors.
  3. Remove the sensors using the O2 sensor socket.
  4. Inspect the threads for damage and clean the mounting holes.
  5. Install the new sensors, ensuring they are tightened to the manufacturer's specifications (typically around 30 ft-lbs).
  6. Reconnect the electrical connectors to the sensors.

3. Inspect and Replace the Catalytic Converter

• Tools Required: Socket set, exhaust pipe cutter (if applicable), new gaskets.
• Sub-steps:
  1. Check for any physical damage to the catalytic converter.
  2. If replacement is necessary, remove the bolts securing the catalytic converter to the exhaust system.
  3. Cut the exhaust pipes if needed to remove the old converter.
  4. Install the new catalytic converter using new gaskets to prevent leaks.
  5. Secure it in place with the bolts, tightening them to the manufacturer's torque specifications.

4. Clear Codes and Test Drive

• Tools Required: OBD-II scanner.
• Sub-steps:
  1. Reconnect the negative battery terminal.
  2. Use the OBD-II scanner to clear the P0420 code.
  3. Start the engine and perform a test drive to ensure the code does not reappear.