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

Solution

1. Preparation

• Gather all necessary tools and parts.
• Disconnect the negative terminal of the battery to prevent electrical shorts.

2. Inspect and Replace Oxygen Sensors

• Tools Required: O2 sensor socket, wrench set, multimeter
• Sub-steps:
  1. Locate the upstream and downstream oxygen sensors.
  2. Disconnect the wiring harness from the sensors.
  3. Use the O2 sensor socket to remove the sensors.
  4. Install the new oxygen sensors and tighten them to the manufacturer's specifications (typically 30-40 ft-lbs).
  5. Reconnect the wiring harness securely.

3. Inspect and Replace the Catalytic Converter

• Tools Required: Socket set, torque wrench, exhaust pipe cutter (if necessary)
• Sub-steps:
  1. Raise the vehicle using a jack and secure it with jack stands.
  2. Remove the bolts securing the catalytic converter to the exhaust system.
  3. Carefully detach the catalytic converter from its mounts and remove it.
  4. Install the new catalytic converter, ensuring proper alignment and sealing.
  5. Torque the bolts to the manufacturer's specifications (usually around 15-20 ft-lbs).
  6. Reconnect any exhaust hangers or brackets as necessary.

4. Clear the Codes

• Use the OBD-II scanner to clear the P0420 code from the vehicle's memory.
• Reconnect the negative battery terminal.