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

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the battery to ensure safety.
• Allow the vehicle to cool if the engine has been running.

2. Inspect and Replace Oxygen Sensors

• Tools Required: O2 sensor socket, ratchet, torque wrench.
• Sub-steps:
  1. Locate the upstream (pre-catalytic) and downstream (post-catalytic) oxygen sensors.
  2. Use the O2 sensor socket to remove the upstream oxygen sensor.
  3. Install the new upstream sensor, tightening it to the manufacturer’s specified torque (usually around 30 ft-lbs).
  4. Repeat the process for the downstream oxygen sensor if necessary.

3. Inspect and Replace the Catalytic Converter

• Tools Required: Wrench set, exhaust hanger removal tool, torque wrench.
• Sub-steps:
  1. Disconnect the exhaust pipes from the catalytic converter using a wrench.
  2. Remove any exhaust hangers using the exhaust hanger removal tool.
  3. Remove the catalytic converter from the vehicle.
  4. Install the new catalytic converter, ensuring a proper fit and alignment.
  5. Reconnect the exhaust pipes and tighten to the manufacturer's torque specifications.

4. Reconnect Battery and Clear Codes

• Sub-steps:
  1. Reconnect the battery terminals securely.
  2. Use the OBD-II scanner to clear the P0420 trouble code.
  3. Start the engine and let it idle for a few minutes.