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

Solution

1. Preparation

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

2. Inspect and Replace Oxygen Sensors

1. Locate the upstream (pre-catalytic converter) and downstream (post-catalytic converter) oxygen sensors.
2. Unplug the electrical connectors from both sensors.
3. Use a socket wrench to remove the sensors from the exhaust manifold and the catalytic converter.
4. Install new oxygen sensors, ensuring they are tightened to the manufacturer's specifications (generally 30-40 ft-lbs).
5. Reconnect the electrical connectors to the sensors.

3. Inspect and Replace Catalytic Converter (if necessary)

1. If the catalytic converter is damaged or clogged, remove the exhaust components leading to it.
2. Use a wrench to disconnect the exhaust pipes from the catalytic converter.
3. Remove any mounting bolts and brackets securing the catalytic converter.
4. Install the new catalytic converter, ensuring a proper fit and seal.
5. Reattach the exhaust pipes and tighten all connections to the manufacturer's specifications.

4. Reconnect Battery and Clear Codes

1. Reconnect the battery terminals, ensuring they are tight.
2. Use the OBD-II scanner to clear the P0420 code from the vehicle's memory.