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

Solution

1. Preparation

• Gather necessary tools and parts.
• Ensure the vehicle is on a level surface and secure it with wheel chocks.
• Disconnect the battery to prevent any electrical shorts.

2. Inspect and Replace Oxygen Sensors (if necessary)

• Sub-steps:
  1. Locate the upstream and downstream oxygen sensors (usually before and after the catalytic converter).
  2. Use a socket wrench to remove the sensors after disconnecting the electrical connectors.
  3. Install new oxygen sensors, ensuring they are torqued to the manufacturer’s specifications (typically around 30 lb-ft).
  4. Reconnect the electrical connectors securely.

3. Inspect and Replace the Catalytic Converter (if necessary)

• Sub-steps:
  1. Remove the exhaust heat shield if applicable.
  2. Unbolt the catalytic converter from the exhaust manifold and the downpipe using a socket set.
  3. Inspect the gaskets and replace if degraded.
  4. Install the new catalytic converter, ensuring proper alignment and torque specifications (generally around 30 lb-ft).
  5. Reinstall the heat shield if it was removed.

4. Clear Codes and Test Drive

• Sub-steps:
  1. Reconnect the battery.
  2. Use the OBD-II scanner to clear the P0420 code from the vehicle’s computer.
  3. Start the engine and perform a test drive to monitor the vehicle's performance and ensure the code does not return.