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 any electrical shorts.

2. Inspect and Replace Oxygen Sensors

1. Locate the upstream (pre-catalytic) and downstream (post-catalytic) oxygen sensors.
2. Use a wrench to carefully disconnect the electrical connectors from both sensors.
3. Unscrew the oxygen sensors using an O2 sensor socket.
4. Install the new oxygen sensors:
   • Apply anti-seize compound to the threads of the new sensors (if applicable).
   • Screw in the new sensors and tighten to manufacturer specifications (usually around 30 Nm).
5. Reconnect the electrical connectors securely.

3. Inspect and Replace the Catalytic Converter

1. Remove any heat shields or brackets covering the catalytic converter.
2. Disconnect the exhaust pipes from the catalytic converter by loosening the bolts or clamps.
3. Remove the old catalytic converter from its mounting location.
4. Install the new catalytic converter:
   • Ensure gaskets are in place and in good condition.
   • Align the converter and secure it with bolts to the exhaust system.
   • Torque bolts to manufacturer specifications (usually around 40-50 Nm).
5. Reinstall any heat shields or brackets removed earlier.

4. Reconnect Battery and Clear Codes

1. Reconnect the battery terminals.
2. Use an OBD-II scanner to clear the P0420 code from the system.
3. Start the engine and let it idle for a few minutes to ensure proper operation.