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

Solution

1. Preparation

• Gather all necessary tools and parts.
• Ensure the vehicle is parked on a level surface and the engine is cool.

2. Inspect and Replace Oxygen Sensors

1. Disconnect Battery: Disconnect the negative terminal of the battery to avoid electrical shorts.
2. Locate Oxygen Sensors: Identify the pre-catalytic and post-catalytic oxygen sensors.
3. Remove Sensors:
   • Use an oxygen sensor socket or wrench to carefully unscrew the sensors from their respective locations.
4. Install New Sensors:
   • Apply anti-seize compound to the threads of the new oxygen sensors.
   • Screw in the new sensors and tighten to the manufacturer’s specifications (typically 30-40 lb-ft).
5. Reconnect Battery: Reconnect the negative battery terminal.

3. Inspect and Replace Catalytic Converter (if necessary)

1. Raise Vehicle: Use a jack and jack stands to elevate the vehicle safely.
2. Remove Exhaust Components:
   • Unbolt the exhaust pipe from the catalytic converter using the appropriate socket set.
   • Remove any hangers or clamps securing the catalytic converter.
3. Install New Catalytic Converter:
   • Position the new catalytic converter in place.
   • Reattach the exhaust pipe, ensuring a tight seal and correct alignment.
4. Torque Specifications: Tighten all bolts to the manufacturer's torque specifications (usually around 30-40 lb-ft).
5. Lower Vehicle: Carefully lower the vehicle back to the ground.