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

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the battery to prevent electrical shorts.
• Ensure the vehicle is parked on a level surface and secured with wheel chocks.

2. Inspect and Replace Oxygen Sensors

• Tools Required: O2 sensor socket, ratchet, torque wrench.
• Remove the upstream oxygen sensor:
  1. Locate the upstream oxygen sensor (usually before the catalytic converter).
  2. Use the O2 sensor socket to unscrew and remove the sensor.
  3. Install the new oxygen sensor and torque it to the manufacturer’s specifications (typically around 30 Nm).
• Repeat the process for the downstream oxygen sensor if necessary.

3. Examine and Replace the Catalytic Converter

• Tools Required: Wrench set, torque wrench, exhaust gasket.
• Remove the catalytic converter:
  1. Disconnect the exhaust pipes from the catalytic converter by loosening the clamps or bolts.
  2. Remove any heat shields and support brackets if necessary.
  3. Carefully take out the catalytic converter.
• Install the new catalytic converter:
  1. Place the new catalytic converter in position and secure it with bolts or clamps, following torque specifications (generally around 40 Nm).
  2. Reinstall heat shields and support brackets.

4. Clear Codes and Test

• Tools Required: OBD-II scanner.
• After completing the repairs, reconnect the battery.
• Use the OBD-II scanner to clear the P0420 code.
• Start the vehicle and let it run for a few minutes to ensure all systems are operational.