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

Solution

1. Preparation

• Gather all tools and parts required for the repair.
• Disconnect the vehicle battery to ensure safety while working on the electrical components.

2. Inspect and Replace Oxygen Sensors

• Tools Required: O2 sensor socket, wrench set, torque wrench
• Remove the upstream oxygen sensor:
  • Locate the sensor on the exhaust manifold.
  • Use the O2 sensor socket to unscrew it.
• Install the new upstream oxygen sensor:
  • Apply anti-seize compound to the threads of the new sensor.
  • Torque to manufacturer's specification (typically around 30-40 lb-ft).
• Repeat the process for the downstream oxygen sensor.

3. Inspect and Replace Catalytic Converter

• Tools Required: Socket set, cutting tools (if necessary), exhaust clamps
• Remove the catalytic converter:
  • Unbolt the exhaust pipes connected to the catalytic converter.
  • If necessary, cut the exhaust pipes using appropriate cutting tools.
• Install the new catalytic converter:
  • Position the new converter and secure it using exhaust clamps.
  • Ensure all connections are tight and leak-free.

4. Reconnect Battery and Clear Codes

• Reconnect the vehicle battery.
• Use the OBD-II scanner to clear the P0420 code from the system.