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

Solution

1. Preparation

• Gather tools and parts required.
• Disconnect the battery to prevent electrical hazards.
• Raise the vehicle using a jack and secure it with jack stands.

2. Inspect and Replace Oxygen Sensors

1. Locate the upstream and downstream oxygen sensors.
2. Disconnect the electrical connectors from both sensors.
3. Use a socket wrench to remove the sensors.
4. Install new oxygen sensors by reversing the removal steps.
   • Torque the oxygen sensors to the manufacturer's specifications (usually around 30 lb-ft).
5. Reconnect the electrical connectors.

3. Inspect and Replace the Catalytic Converter

1. Visually inspect the catalytic converter for any signs of physical damage or blockage.
2. If damaged, remove the exhaust components holding the catalytic converter in place (typically bolts and clamps).
   • Use penetrating oil if bolts are rusted.
3. Remove the old catalytic converter.
4. Install the new catalytic converter by reversing the removal steps.
   • Ensure all bolts are torqued to the manufacturer's specifications (typically around 30 lb-ft).
5. Reattach any heat shields or covers if applicable.

4. Clear the Codes

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