how to fix P0420 code in Honda CR-V Fifth Generation (2017-2022)

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the battery to ensure safety.
• Allow the exhaust system to cool before working on it.

2. Inspect and Replace Oxygen Sensors

1. Locate the upstream and downstream oxygen sensors.
2. Use a wrench to disconnect the electrical connectors from both sensors.
3. Remove the sensors from the exhaust pipe using an oxygen sensor socket.
4. Install the new sensors by reversing the removal steps, ensuring to torque to manufacturer specifications (usually about 30 lb-ft).
5. Reconnect the electrical connectors securely.

3. Examine and Replace Catalytic Converter

1. Inspect the catalytic converter for damage; if damaged, proceed with replacement.
2. Remove the exhaust pipe bolts connecting to the catalytic converter using a socket set.
3. Carefully detach the catalytic converter from the exhaust system.
4. Install the new catalytic converter, ensuring proper alignment and sealing.
5. Torque bolts to the manufacturer's specifications (typically around 30 lb-ft).

4. Clear Codes and Test

1. Reconnect the battery.
2. Use the OBD-II scanner to clear the P0420 code.
3. Start the vehicle and let it reach operating temperature.
4. Monitor the vehicle's performance and check for the reappearance of any codes.