how to fix P0420 code in Honda CR-V Fifth Generation (2017-2022)

Solution

1. Preparation

• Tools Required: OBD-II scanner, socket set, torque wrench, multimeter, safety glasses, gloves.
• Disconnect the battery to prevent any electrical shorts.

2. Inspect and Replace Oxygen Sensors

• Sub-steps:
  1. Locate the upstream and downstream oxygen sensors on the exhaust system.
  2. Disconnect the wiring harness from both oxygen sensors.
  3. Use a socket wrench to remove the sensors from the exhaust pipes.
  4. Install new oxygen sensors, tightening them to the manufacturer's specified torque (typically around 30 lb-ft).
  5. Reconnect the wiring harness to the new oxygen sensors.

3. Examine and Replace Catalytic Converter (if necessary)

• Sub-steps:
  1. Inspect the catalytic converter for any signs of damage, such as dents or excessive soot buildup.
  2. If replacement is needed, remove the bolts connecting it to the exhaust system using a socket set.
  3. Install the new catalytic converter, ensuring all gaskets are in place and the bolts are tightened to the specified torque.
  4. Reconnect any exhaust hangers or brackets that were removed.

4. Clear Error Codes and Test

• Sub-steps:
  1. Reconnect the battery.
  2. Use the OBD-II scanner to clear the P0420 code and any other related codes.
  3. Start the engine and allow it to reach operating temperature.
  4. Perform a test drive to monitor for any reoccurrence of the P0420 code.