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

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the battery to ensure safety during repairs.
• Lift the vehicle securely using jack stands.

2. Inspect and Replace Oxygen Sensors

1. Locate the upstream (pre-catalytic) and downstream (post-catalytic) oxygen sensors.
2. Use a wrench to disconnect the electrical connectors from both sensors.
3. Remove the sensors using an oxygen sensor socket.
4. Install new oxygen sensors by reversing the removal steps, ensuring they are properly torqued (typically 30-40 ft-lbs).
5. Reconnect the electrical connectors securely.

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

1. Inspect the catalytic converter for damage or clogging.
2. If replacement is necessary, unbolt the exhaust flanges connecting the catalytic converter to the exhaust system.
3. Remove the catalytic converter.
4. Install the new catalytic converter in the reverse order, ensuring all bolts are tightened to manufacturer specifications (typically 25-30 ft-lbs).
5. Reconnect any exhaust hangers or brackets.

4. Clear Codes and Test

1. Reconnect the battery.
2. Use the OBD-II scanner to clear the P0420 code.
3. Perform a test drive to monitor system performance and check for reoccurring codes.