how to resolve P0420 code in my Genesis G70 IG (2017-2023)

Solution

1. Preparation

• Gather necessary tools and parts before starting the repair.
• Disconnect the battery to ensure safety while working on electrical components.

2. Replace Faulty Oxygen Sensors

• Tools Required: O2 sensor socket, torque wrench, penetrating oil
• Sub-steps:
  1. Locate the upstream and downstream oxygen sensors.
  2. Apply penetrating oil to the sensor threads and allow it to sit for a few minutes.
  3. Disconnect the electrical connectors from the sensors.
  4. Use the O2 sensor socket to remove the sensors from the exhaust pipe.
  5. Install the new sensors in the reverse order, tightening them to the manufacturer's specified torque (usually around 30 ft-lbs).

3. Replace Catalytic Converter (if necessary)

• Tools Required: Socket set, torque wrench, exhaust clamp tool
• Sub-steps:
  1. Remove the exhaust system components connected to the catalytic converter (if applicable).
  2. Unbolt the catalytic converter from the exhaust manifold and the exhaust pipe.
  3. Remove the old catalytic converter.
  4. Install the new catalytic converter, ensuring proper alignment with flanges.
  5. Torque all bolts to manufacturer specifications (typically around 40 ft-lbs).
  6. Reinstall any exhaust components removed during the process.

4. Clear Codes and Test

• Tools Required: OBD-II scanner
• Sub-steps:
  1. Reconnect the battery.
  2. Use the OBD-II scanner to clear the P0420 code.
  3. Start the vehicle and allow it to reach operating temperature.
  4. Check for reoccurrence of the P0420 code after driving.