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

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the battery to prevent electrical shorts.

2. Inspect and Replace Oxygen Sensors

• Tools Required: O2 sensor socket, ratchet, torque wrench
• Remove the pre-catalytic and post-catalytic oxygen sensors using the O2 sensor socket.
• Inspect the sensors for damage or carbon buildup; replace if necessary.
• Install new sensors and tighten to manufacturer specifications (usually around 30-40 lb-ft).

3. Inspect and Replace Catalytic Converter (if necessary)

• Tools Required: Socket set, jack and jack stands, exhaust pipe cutter, or reciprocating saw
• Raise the vehicle securely on jack stands.
• Disconnect the exhaust system from the catalytic converter using the socket set.
• If the catalytic converter is severely clogged or damaged, cut it out using the exhaust pipe cutter.
• Install the new catalytic converter, ensuring proper alignment and connection to the exhaust system.
• Torque the bolts to manufacturer specifications (typically around 30-40 lb-ft).

4. Reconnect Battery and Clear Codes

• Reconnect the battery and ensure all connections are secure.
• Use the OBD-II scanner to clear the P0420 code and reset the check engine light.