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

Solution

1. Preparation

• Gather tools and parts required for the repair.
• Disconnect the battery to ensure safety during the repair process.

2. Inspect and Replace Oxygen Sensors

• Sub-steps:
  1. Locate the upstream (pre-catalytic) and downstream (post-catalytic) oxygen sensors.
  2. Use an O2 sensor socket to remove the faulty oxygen sensors.
  3. Install the new oxygen sensors, ensuring they are properly torqued (typically around 30-35 ft-lbs).
  4. Reconnect the electrical connectors for both sensors.

3. Examine and Replace Catalytic Converter (if necessary)

• Sub-steps:
  1. If the catalytic converter is damaged or ineffective, remove the exhaust system components leading to the converter.
  2. Unbolt the catalytic converter from the exhaust pipe and any mounting brackets.
  3. Install the new catalytic converter, ensuring all connections are tight and secure.
  4. Torque the bolts to the manufacturer's specifications (typically around 30-40 ft-lbs).
  5. Reconnect any sensors or components removed during the process.

4. Reconnect Battery and Clear Codes

• Sub-steps:
  1. Reconnect the battery terminals.
  2. Use the OBD-II scanner to clear the P0420 code from the vehicle’s computer.
  3. Perform a test drive to ensure the vehicle operates correctly.