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

Solution

1. Preparation

• Ensure the vehicle is parked on a level surface and the engine is cool.
• Disconnect the negative battery terminal to avoid any electrical shorts.
• Gather all necessary tools and parts.

2. Replace Oxygen Sensors (if faulty)

• Tools Required: O2 sensor socket, wrench, penetrating oil (if necessary).
• Sub-steps:
  1. Locate the upstream and downstream oxygen sensors in the exhaust system.
  2. Apply penetrating oil to the sensor threads if they are rusted.
  3. Use the O2 sensor socket to unscrew the old sensors and remove them.
  4. Install the new sensors by threading them into place and tightening them to the manufacturer's specified torque (usually around 30 ft-lbs).
  5. Reconnect the electrical connectors to the sensors.

3. Inspect and Replace Catalytic Converter (if necessary)

• Tools Required: Socket set, jack stands, exhaust pipe cutter if needed.
• Sub-steps:
  1. Raise the vehicle using jack stands and secure it.
  2. Remove any heat shields covering the catalytic converter.
  3. Use an exhaust pipe cutter to separate the catalytic converter from the exhaust piping if it's welded.
  4. Install the new catalytic converter, ensuring proper alignment with mounting points.
  5. Tighten all bolts and clamps to the specified torque (typically around 25-35 ft-lbs).
  6. Reinstall any heat shields.

4. Clear Error Codes

• Reconnect the negative battery terminal.
• Use the OBD-II scanner to clear the P0420 code from the vehicle's computer system.