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

Solution

1. Preparation

• Gather tools and parts required for the repair.
• 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

1. Locate the upstream and downstream oxygen sensors.
2. Remove the electrical connectors from both sensors.
3. Use a socket wrench to unscrew the sensors from the exhaust pipe.
4. Install the new oxygen sensors, ensuring they are tightened to the manufacturer's specifications (usually around 30 ft-lbs).
5. Reconnect the electrical connectors.

3. Replace the Catalytic Converter

1. Raise the vehicle using a jack and secure it with jack stands.
2. Remove any heat shields or components obstructing access to the catalytic converter.
3. Unbolt the catalytic converter from the exhaust manifold and the tailpipe.
4. Remove the old catalytic converter and install the new one, ensuring proper alignment.
5. Torque the bolts to manufacturer specifications (typically around 25-35 ft-lbs).
6. Reinstall any heat shields or components removed earlier.

4. Verify Exhaust System Integrity

1. Inspect all connections and joints in the exhaust system for leaks.
2. Start the engine and listen for any unusual noises or leaks in the exhaust system.