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

Solution

1. Preparation

• Gather necessary tools and parts.
• Ensure the vehicle is parked on a level surface and the engine is cool.
• Disconnect the battery before starting work on electrical components.

2. Inspect and Repair Exhaust System

• Tools Required: Socket set, torque wrench
• Inspect the exhaust system for any leaks or cracks. Use a flashlight to check hard-to-see areas.
• If leaks are found, seal them with exhaust repair tape or replace the damaged section of the exhaust.
• Reassemble any removed components and torque to specified values.

3. Replace Oxygen Sensors (if defective)

• Tools Required: O2 sensor socket, torque wrench
• Locate the upstream and downstream oxygen sensors in the exhaust system.
• Disconnect the electrical connectors from the sensors.
• Use the O2 sensor socket to remove the sensors from their respective locations.
• Apply anti-seize compound to the threads of the new sensors and install them, tightening them to the manufacturer's specifications (usually around 30 lb-ft).
• Reconnect the electrical connectors.

4. Replace Catalytic Converter (if necessary)

• Tools Required: Sawzall or exhaust cutter, socket set, torque wrench
• If the catalytic converter is damaged or clogged, it must be replaced.
• Use a sawzall or exhaust cutter to remove the old catalytic converter from the exhaust pipes.
• Install the new catalytic converter, ensuring the orientation is correct.
• Bolt the new converter in place, tightening to the manufacturer's torque specifications.
• Ensure all connections are secure and leak-free.

5. Reconnect Battery

• Reconnect the battery and ensure all electrical connections are secure.