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

Solution

1. Preparation

• Tools Required: OBD-II scanner, multimeter, socket set, jack and jack stands.
• Disconnect the battery to prevent electrical shorts.
• Raise the vehicle using a jack and secure it with jack stands.

2. Inspect and Replace the Oxygen Sensors

• Sub-steps:
  1. Locate the upstream (pre-catalytic) and downstream (post-catalytic) oxygen sensors.
  2. Disconnect the electrical connectors from both sensors.
  3. Use a socket to remove the sensors from the exhaust system.
  4. Install new oxygen sensors, applying anti-seize compound to the threads.
  5. Reconnect the electrical connectors.

3. Inspect the Catalytic Converter

• Sub-steps:
  1. Visually inspect the catalytic converter for any physical damage or signs of clogging.
  2. If damaged, remove the catalytic converter using appropriate sockets and wrenches.
  3. Install a new catalytic converter, ensuring proper alignment and sealing.
  4. Torque the bolts to the manufacturer’s specifications.

4. Clear the Codes and Test Drive

• Sub-steps:
  1. Reconnect the battery.
  2. Use the OBD-II scanner to clear the P0420 code.
  3. Start the engine and let it idle for a few minutes.
  4. Take the vehicle for a test drive to ensure the check engine light does not reappear.