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

Solution

1. Preparation

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

2. Inspect and Replace Oxygen Sensors

• Tools Required: O2 sensor socket, wrench set, torque wrench
• Sub-steps:
  1. Locate the upstream and downstream oxygen sensors.
  2. Remove the connectors from the sensors.
  3. Use the O2 sensor socket to unscrew the sensors from the exhaust pipe.
  4. Install new oxygen sensors and torque to manufacturer specifications (usually around 30 lb-ft).
  5. Reconnect the sensors.

3. Inspect and Replace the Catalytic Converter

• Tools Required: Socket set, jack and jack stands, exhaust pipe cutter or saw, gasket scraper
• Sub-steps:
  1. Raise the vehicle using a jack and secure it on jack stands.
  2. Remove the bolts connecting the catalytic converter to the exhaust manifold and the exhaust pipe.
  3. If necessary, use an exhaust pipe cutter to detach old converter.
  4. Clean the mating surfaces on the exhaust manifold and exhaust pipe.
  5. Install the new catalytic converter with new gaskets, ensuring proper alignment.
  6. Torque all bolts to manufacturer specifications (usually around 25 lb-ft).

4. Reconnect Battery and Clear Codes

• Sub-steps:
  1. Reconnect the negative battery terminal.
  2. Use an OBD-II scanner to clear the P0420 code from the vehicle’s computer.
  3. Start the engine and allow it to reach operating temperature.