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

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the battery to prevent electrical shorts.
• Raise the vehicle securely on jack stands for access to the exhaust system.

2. Inspect and Replace O2 Sensors

• Tools Required: O2 sensor socket, ratchet and extensions, torque wrench.
• Sub-steps:
  1. Locate the upstream and downstream O2 sensors.
  2. Disconnect the electrical connectors from both sensors.
  3. Using the O2 sensor socket, remove the upstream sensor first, followed by the downstream sensor.
  4. Install new O2 sensors, tightening them to the manufacturer’s specified torque (typically around 30 ft-lbs).
  5. Reconnect the electrical connectors to both sensors.

3. Inspect Catalytic Converter

• Tools Required: Torque wrench, exhaust pipe cutter (if needed).
• Sub-steps:
  1. Visually inspect the catalytic converter for any signs of damage or clogging.
  2. If damaged, remove the catalytic converter by loosening the bolts or clamps securing it to the exhaust system.
  3. Install a new catalytic converter, ensuring proper alignment and secure all bolts to the specified torque (usually around 25-30 ft-lbs).

4. Clear Codes and Test

• Tools Required: OBD-II scanner.
• Sub-steps:
  1. Reconnect the battery.
  2. Use the OBD-II scanner to clear the P0420 code from the ECM.
  3. Start the engine and allow it to reach operating temperature.
  4. Take the vehicle for a test drive to confirm the code does not reappear.