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

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the negative battery terminal.
• Raise the vehicle securely on jack stands for access.

2. Inspect and Replace Oxygen Sensors

1. Locate the upstream and downstream oxygen sensors.
2. Remove the electrical connectors from both sensors.
3. Use an O2 sensor socket to unscrew the sensors from the exhaust system.
4. Install the new sensors by threading them into place and tightening to the manufacturer’s specified torque (typically around 30 lb-ft).
5. Reconnect the electrical connectors.

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

1. Remove any mounting bolts or clamps securing the catalytic converter to the exhaust system.
2. Carefully detach the catalytic converter from the exhaust pipes.
3. Inspect the old catalytic converter for damage; if it’s clogged or damaged, replace it.
4. Install the new catalytic converter by reversing the removal process and ensuring all bolts are tightened to specifications.
5. Ensure all gaskets are replaced to prevent leaks.

4. Clear Codes and Test Drive

1. Reconnect the negative battery terminal.
2. Use the OBD-II scanner to clear the P0420 code from the vehicle’s memory.
3. Start the engine and allow it to reach operating temperature.
4. Take the vehicle for a test drive to monitor performance and check for the reappearance of the check engine light.