how to troubleshoot my Genesis G70 IG (2017-2023) with P0420 code

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the vehicle battery to avoid electrical shorts.
• Ensure the vehicle is on a flat surface and secure it with wheel chocks.

2. Inspect and Replace Oxygen Sensors

• Tools Required: O2 sensor socket, wrench set, multimeter.
• Remove the upstream oxygen sensor using the O2 sensor socket.
  • Disconnect the sensor's electrical connector.
  • Install the new sensor and reconnect the electrical connector.
• Repeat for the downstream oxygen sensor if it's also suspected to be faulty.

3. Examine and Replace Catalytic Converter

• Tools Required: Socket set, jack and jack stands, exhaust pipe cutter (if necessary).
• Safely lift the vehicle and support it with jack stands.
• Disconnect the exhaust pipes from the catalytic converter.
  • Remove any mounting bolts or clamps securing the converter.
• Inspect the catalytic converter for signs of damage or blockage.
• If damaged, replace the catalytic converter with a new unit and reconnect all exhaust components.

4. Clear Codes and Test Drive

• Tools Required: OBD-II scanner.
• Reconnect the vehicle battery.
• Use the OBD-II scanner to clear the P0420 code.
• Conduct a test drive to verify the repair.