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

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the negative battery terminal to prevent electrical shorts.
• Allow the engine to cool down completely.

2. Inspect and Replace Oxygen Sensors

1. Locate the upstream (pre-catalytic converter) and downstream (post-catalytic converter) oxygen sensors.
2. Use an O2 sensor socket to remove the sensors from their respective locations.
3. Inspect the sensors for contamination or damage. If faulty, replace them with OEM or high-quality aftermarket sensors.
4. Reconnect the sensors securely and reconnect the battery terminal.

3. Inspect and Replace Catalytic Converter (if necessary)

1. Remove any components obstructing access to the catalytic converter (e.g., heat shields, exhaust pipes).
2. Use a socket set to unbolt the catalytic converter from the exhaust system.
3. Inspect the catalytic converter for signs of clogging or physical damage. If damaged, replace it with an OEM part.
4. Install the new catalytic converter, ensuring proper alignment and securing it with the appropriate torque specifications (typically 30-40 lb-ft).
5. Reinstall any removed components and ensure all connections are tight.

4. Clear Codes and Test

1. Use the OBD-II scanner to clear any stored codes from the vehicle’s computer.
2. Start the engine and allow it to reach operating temperature.
3. Take the vehicle for a test drive to monitor for any reoccurrence of the P0420 code.