how to fix P0420 code on my 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 to prevent electrical shorts.

2. Inspect and Replace Oxygen Sensors

• Tools Required: O2 sensor socket, wrench set, electrical cleaner
• Remove the upstream and downstream oxygen sensors using an O2 sensor socket.
• Inspect the sensors for carbon buildup or physical damage.
• If damaged, replace them with new sensors, ensuring they are compatible with the CR-V model.
• Reconnect the electrical connectors securely.

3. Inspect and Replace the Catalytic Converter

• Tools Required: Socket set, exhaust pipe cutter, jack stands
• Remove the exhaust heat shield if applicable.
• Use an exhaust pipe cutter to cut the exhaust pipe on both sides of the catalytic converter.
• Remove the old catalytic converter from the exhaust system.
• Install the new catalytic converter, ensuring it is oriented correctly.
• Use new exhaust clamps or bolts to secure the installation, tightening them to the manufacturer’s specifications.

4. Reconnect Components

• Reattach the exhaust heat shield if removed.
• Reconnect the battery.
• Clear the P0420 code using the OBD-II scanner.