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

Solution

1. Preparation

• Tools Required: OBD-II scanner, multimeter, socket set, jack stands, safety glasses, gloves.
• Ensure the vehicle is parked on a flat surface and the engine is cool.
• Disconnect the battery to avoid electrical shorts.

2. Inspect and Replace Oxygen Sensors

1. Locate the upstream (pre-catalytic converter) and downstream (post-catalytic converter) oxygen sensors.
2. Disconnect the electrical connectors from both sensors.
3. Using a socket wrench, remove the sensors from the exhaust system.
4. Install the new oxygen sensors, ensuring they are torqued to the manufacturer specifications (usually around 30-40 lb-ft).
5. Reconnect the electrical connectors.

3. Inspect and Replace the Catalytic Converter

1. Remove any heat shields or brackets securing the catalytic converter.
2. Using a socket set, unbolt the catalytic converter from the exhaust pipe.
3. Inspect the old catalytic converter for any signs of damage or clogging.
4. Install the new catalytic converter, securing it with bolts and gaskets as per manufacturer specifications.
5. Reattach heat shields and brackets as necessary.

4. Reconnect Battery and Clear Codes

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