my Genesis G70 IG (2017-2023) has a check engine light and I'm getting P0420 code

Solution

1. Preparation

• Ensure the vehicle is parked on a flat surface and the engine is cool.
• Disconnect the battery to prevent electrical issues during the repair.

2. Inspect and Replace Oxygen Sensors

• Tools Required: O2 sensor socket, ratchet and extensions, torque wrench.
• Sub-steps:
  1. Locate the upstream (pre-catalytic) and downstream (post-catalytic) oxygen sensors in the exhaust system.
  2. Unplug the electrical connectors from each oxygen sensor.
  3. Using the O2 sensor socket, carefully remove the upstream oxygen sensor and inspect for damage.
  4. Install the new upstream oxygen sensor, tightening it to the manufacturer's specified torque value (typically around 30-40 lb-ft).
  5. Repeat the process for the downstream oxygen sensor if necessary.

3. Inspect Catalytic Converter

• Tools Required: Jack and jack stands, exhaust pipe cutter (if necessary).
• Sub-steps:
  1. Raise the vehicle using a jack and secure it on jack stands.
  2. Inspect the catalytic converter for any physical damage, rattling sounds, or discoloration.
  3. If damage is found, remove the catalytic converter by cutting the exhaust pipes if necessary.
  4. Install the new catalytic converter, ensuring proper fitment and sealing.
  5. Use exhaust clamps or welding as necessary to secure the connections.

4. Reconnect Battery and Clear Codes

• Reconnect the battery terminals securely.
• Use the OBD-II scanner to clear the P0420 code and any other related codes from the system.