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

Solution

1. Preparation

• Gather tools and parts required for the repair.
• Disconnect the vehicle's battery to prevent electrical shorts.
• Allow the engine to cool down before proceeding.

2. Inspect and Replace Oxygen Sensors

• Sub-steps:
  1. Locate the upstream (pre-catalytic) and downstream (post-catalytic) oxygen sensors.
  2. Use an O2 sensor socket or wrench to unscrew the faulty sensor.
  3. Install the new oxygen sensor and torque it to manufacturer specifications (typically around 30 lb-ft).
  4. Reconnect the electrical connector to the sensor.
• Tools Required: O2 sensor socket, torque wrench.

3. Inspect and Replace Catalytic Converter

• Sub-steps:
  1. Remove the exhaust pipes connected to the catalytic converter using a socket set.
  2. Unbolt the catalytic converter from the exhaust manifold and remove it from the vehicle.
  3. Inspect the new catalytic converter for any signs of damage before installation.
  4. Install the new catalytic converter, ensuring proper alignment and sealing.
  5. Torque the bolts to manufacturer specifications.
  6. Reattach the exhaust pipes and secure all connections.
• Tools Required: Socket set, torque wrench, exhaust hangers.

4. Reset the Engine Control Module (ECM)

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