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 vehicle to cool down before working on the exhaust components.

2. Oxygen Sensor Replacement (if faulty)

1. Locate the upstream and downstream oxygen sensors on the exhaust system.
2. Disconnect the electrical connectors from the oxygen sensors.
3. Use an O2 sensor socket to remove the faulty sensor from the exhaust pipe.
4. Install the new oxygen sensor by threading it into the exhaust pipe and tightening it to the manufacturer's torque specification (usually around 30-40 lb-ft).
5. Reconnect the electrical connectors to the new oxygen sensor.

3. Catalytic Converter Replacement (if necessary)

1. If the catalytic converter is determined to be faulty, locate it in the exhaust system.
2. Use a socket set to remove the bolts securing the catalytic converter to the exhaust system.
3. Carefully detach the catalytic converter from the exhaust pipes.
4. Install the new catalytic converter, ensuring proper alignment and sealing.
5. Torque the bolts to the manufacturer's specifications (typically around 30-45 lb-ft).
6. Reconnect any heat shields or additional components that were removed.

4. Reset the ECU

1. Reconnect the vehicle's battery.
2. Use an OBD-II scanner to clear the P0420 code from the ECU.
3. Start the engine and allow it to reach operating temperature.