my Genesis G70 IG (2017-2023) has a check engine light with code P0420, what does it mean?

Solution

1. Preparation

• Gather necessary tools and parts.
• Ensure the vehicle is parked on a flat surface and the engine is cool.
• Disconnect the negative battery terminal to prevent electrical shorts.

2. Inspect and Replace Oxygen Sensors

• Tools Required: O2 sensor socket, ratchet, and torque wrench.
• Remove the pre-catalytic converter oxygen sensor:
  • Locate the sensor on the exhaust manifold.
  • Use the O2 sensor socket to remove the sensor.
• Install the new oxygen sensor:
  • Apply anti-seize compound to the threads of the new sensor.
  • Torque to manufacturer's specifications (typically around 30 ft-lbs).
• Repeat for the post-catalytic converter oxygen sensor if necessary.

3. Inspect and Replace Catalytic Converter (if necessary)

• Tools Required: Wrench set, jack and jack stands, exhaust pipe cutter (if needed).
• Remove the catalytic converter:
  • Raise the vehicle and secure it on jack stands.
  • Disconnect the exhaust pipes from the catalytic converter using a wrench or exhaust cutter.
• Install the new catalytic converter:
  • Position the new converter in place and reconnect exhaust pipes.
  • Tighten all connections to the manufacturer's torque specifications.

4. Reset Engine Control Unit (ECU)

• Reconnect the battery terminal.
• Use the OBD-II scanner to clear the P0420 code from the ECU.