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

Solution

1. Preparation

• Gather necessary tools and parts.
• Ensure the vehicle is parked on a flat surface and the engine is off.
• Disconnect the battery to prevent any electrical short circuits.

2. Inspect and Replace Oxygen Sensors

• Tools Required: O2 sensor socket, ratchet, torque wrench
• Sub-steps:
  1. Locate the upstream (pre-catalytic converter) and downstream (post-catalytic converter) oxygen sensors.
  2. Disconnect the electrical connectors from both sensors.
  3. Use the O2 sensor socket to remove the sensors from the exhaust manifold and catalytic converter.
  4. Install new oxygen sensors, tightening them to the manufacturer's specified torque (typically around 30 Nm).
  5. Reconnect the electrical connectors securely.

3. Inspect and Replace the Catalytic Converter (if needed)

• Tools Required: Socket set, torque wrench, exhaust gasket
• Sub-steps:
  1. Visually inspect the catalytic converter for physical damage or rattling noise.
  2. Remove any heat shields covering the catalytic converter, if applicable.
  3. Detach the exhaust piping from both ends of the catalytic converter using a socket set.
  4. Remove the old catalytic converter and replace it with a new unit, ensuring to install a new exhaust gasket.
  5. Reattach the exhaust piping and tighten to the manufacturer's specified torque.
  6. Replace any heat shields that were removed.

4. Clear Codes and Test

• Tools Required: OBD-II scanner
• Sub-steps:
  1. Reconnect the battery.
  2. Start the engine and allow it to warm up to normal operating temperature.
  3. Use the OBD-II scanner to clear the P0420 code.
  4. Conduct a test drive to ensure the code does not return.