what does it mean if my Honda Accord Eleventh Generation (2023-present) has a P0420 code?

Solution

1. Preparation

• Gather tools and parts required for the repair.
• Disconnect the vehicle's battery to ensure safety during work.

2. Inspect and Replace Oxygen Sensors (if faulty)

1. Remove the oxygen sensor from the exhaust manifold using an oxygen sensor socket.
   • Tools Required: Oxygen sensor socket, ratchet.
   • Safety Warning: Allow the exhaust system to cool before handling sensors.
2. Install the new oxygen sensor and torque it to the manufacturer’s specifications (usually around 30 ft-lbs).
3. Reconnect the electrical connector securely.

3. Inspect and Replace Catalytic Converter (if necessary)

1. Raise the vehicle securely on jack stands.
2. Remove the exhaust bolts connecting the catalytic converter to the exhaust manifold and the exhaust pipe.
   • Tools Required: Socket set, breaker bar.
3. Gently remove the catalytic converter from the vehicle.
4. Install the new catalytic converter, ensuring proper alignment.
5. Torque the exhaust bolts to the manufacturer's specifications (typically around 25-35 ft-lbs).

4. Reconnect Battery and Clear Codes

1. Reconnect the vehicle’s battery.
2. Use the OBD-II scanner to clear the P0420 code from the system.