how to fix P0420 Honda CR-V Sixth Generation (2023-present) without expensive repairs

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 avoid electrical shorts.

2. Inspect and Replace Oxygen Sensors

• Tools Required: O2 sensor socket, wrench set
• Remove the O2 sensor(s) from the exhaust system.
• Inspect for carbon build-up; clean if necessary.
• Replace with new sensors if faulty, ensuring proper torque (typically around 30 lb-ft).

3. Check and Repair Exhaust Leaks

• Tools Required: Exhaust leak detector or soapy water, socket set
• Use an exhaust leak detector or soapy water to identify leaks in the exhaust system.
• Tighten any loose bolts or connections.
• Replace damaged exhaust components as needed.

4. Inspect and Clean Catalytic Converter

• Tools Required: Jack stands, socket set
• If blockage is suspected, remove the catalytic converter from the vehicle.
• Inspect for internal damage or blockage.
• Clean with a catalytic converter cleaner or replace if heavily damaged.

5. Reinstall Components and Reconnect Battery

• Reverse the removal steps to reinstall any components that were taken apart.
• Ensure all connections are secure.
• Reconnect the battery.