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

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the battery to ensure safety while working on the vehicle.
• Allow the engine to cool down before starting.

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 using an oxygen sensor socket.
4. Install the new oxygen sensors by reversing the removal steps.
   • Torque the sensors to the manufacturer’s specifications (typically around 30 ft-lb).
5. Reconnect the electrical connectors.

3. Inspect and Replace Catalytic Converter

1. Identify the location of the catalytic converter in the exhaust system.
2. Remove any heat shields if necessary.
3. Disconnect the exhaust pipes from both ends of the catalytic converter using a socket set.
4. Remove any mounting bolts or brackets holding the catalytic converter in place.
5. Install the new catalytic converter in the reverse order of removal:
   • Ensure proper alignment and fitment.
   • Torque the bolts to the manufacturer's specifications (check for specific values).
6. Reattach any heat shields.

4. Clear Engine Codes

1. Reconnect the vehicle’s battery.
2. Use an OBD-II scanner to clear the P0420 code and any other related codes.
3. Perform a short test drive to ensure the code does not reappear.