my Honda CR-V Sixth Generation (2023-present) has a check engine light and code P0420, what do I do?

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the battery to ensure safety during repairs.
• Allow the engine to cool before starting work.

2. Inspect and Clean the Oxygen Sensor

• Locate the upstream and downstream oxygen sensors on the exhaust system.
• Remove the oxygen sensors using an oxygen sensor socket.
• Clean the threads and connectors of the sensors with electrical contact cleaner.
• Reinstall the sensors and torque to the manufacturer's specifications (typically around 30-40 ft-lbs).

3. Examine the Catalytic Converter

• Inspect the catalytic converter for any physical damage or signs of overheating.
• If damage is noted, proceed to replace the catalytic converter.
• Remove the mounting bolts and any necessary heat shields to access the catalytic converter.
• Install the new catalytic converter, ensuring proper alignment and torque specifications (usually around 30-40 ft-lbs for bolts).

4. Reconnect Battery and Clear Codes

• Reconnect the battery terminals and ensure they are secured.
• Use the OBD-II scanner to clear the P0420 code from the vehicle's computer.

5. Test Drive and Monitor

• Take the vehicle for a test drive to ensure the check engine light does not reappear.
• Monitor performance and emissions during the drive to confirm proper operation.