how to fix P0420 code on Genesis G70 IG (2017-2023)

Solution

1. Preparation

• Gather necessary tools and parts.
• Ensure the vehicle is parked on a level surface and the engine is turned off.
• Disconnect the battery to prevent electrical issues during repair.

2. Inspect and Replace Oxygen Sensors

1. Locate the upstream and downstream oxygen sensors on the exhaust system.
2. Use a socket wrench to remove the defective oxygen sensors.
3. Install the new oxygen sensors, ensuring they are properly tightened (typically 30-40 ft-lbs torque).
4. Reconnect the battery.

3. Inspect and Replace the Catalytic Converter (if necessary)

1. Remove any heat shields or covers obstructing access to the catalytic converter.
2. Disconnect the exhaust pipes and any mounting brackets securing the catalytic converter.
3. Carefully detach the old catalytic converter from the exhaust system.
4. Install the new catalytic converter, ensuring the gaskets are in place to prevent leaks.
5. Reattach exhaust pipes and brackets, tightening bolts to the manufacturer's specifications (typically around 20-30 ft-lbs torque).

4. Clear Codes and Test

1. Use an OBD-II scanner to clear the P0420 code from the system.
2. Start the engine and let it warm up to operating temperature.
3. Take the vehicle for a test drive to monitor for any reoccurrence of the check engine light.