how to resolve P0420 error code in my Genesis G70 IG (2017-2023)?

Solution

1. Preparation

• Gather necessary tools and parts for the repair.
• Disconnect the battery to prevent electrical shorts during the procedure.

2. Inspect and Replace Oxygen Sensors

• Tools Required: O2 sensor socket, torque wrench

• Remove the upstream oxygen sensor (pre-catalytic converter):

  1. Locate the sensor and disconnect the electrical connector.
  2. Use an O2 sensor socket to remove the sensor.
  3. Install the new oxygen sensor, ensuring it is torqued to manufacturer specifications (typically around 30 lb-ft).
  4. Reconnect the electrical connector.

• Repeat the process for the downstream oxygen sensor (post-catalytic converter).

3. Inspect and Replace Catalytic Converter (if necessary)

• Tools Required: Socket set, exhaust clamp tool, cutting tool (if needed)

• Remove the catalytic converter:

  1. Loosen and remove the exhaust clamps or bolts securing the catalytic converter.
  2. Carefully detach the catalytic converter from the exhaust system. If it is welded, use a cutting tool to remove it.

• Install the new catalytic converter:

  1. Position the new catalytic converter in place.
  2. Secure it with new clamps or bolts, torquing them to the specified values.

4. Clear Error Codes

• Reconnect the battery and use an OBD-II scanner to clear the P0420 error code.
• Perform a test drive to monitor the vehicle's performance and ensure the code does not return.