how do I fix P0420 code in my Genesis G70 IG (2017-2023)

Solution

1. Preparation

• Gather the necessary tools and parts.
• Disconnect the battery to ensure safety during repairs.

2. Inspect and Replace Oxygen Sensors

1. Locate the Oxygen Sensors:

   • Identify the upstream (pre-catalytic converter) and downstream (post-catalytic converter) oxygen sensors.

2. Remove the Old Oxygen Sensors:

   • Use an oxygen sensor socket and ratchet to remove the upstream and downstream oxygen sensors.
   • Be cautious to avoid damaging the wiring harness.

3. Install New Oxygen Sensors:

   • Apply anti-seize compound to the threads of the new sensors (if not pre-applied).
   • Install the upstream and downstream sensors, tightening them to the manufacturer’s specifications (typically around 30 lb-ft).

3. Inspect and Replace the Catalytic Converter (if necessary)

1. Remove the Exhaust Components:

   • Disconnect the exhaust pipe from the catalytic converter using a socket set.
   • Support the exhaust system to prevent strain during removal.

2. Replace the Catalytic Converter:

   • Remove the old catalytic converter from its mounting points.
   • Install the new catalytic converter, ensuring proper alignment and securing it with the bolts.

3. Reattach Exhaust Components:

   • Reconnect the exhaust pipe to the new catalytic converter.
   • Tighten the connections to the specified torque values.

4. Reset the Check Engine Light

1. Reconnect the Battery:

   • Reconnect the battery terminals securely.

2. Clear Error Codes:

   • Use the OBD-II scanner to clear the P0420 code and reset the check engine light.