how to fix P0420 code in Toyota Camry Eighth Generation (2018-present)

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the battery to ensure safety while working on the electrical systems.

2. Inspect Oxygen Sensors

• Remove the upstream and downstream oxygen sensors using an O2 sensor socket.
• Inspect the sensors for carbon buildup or damage.
• If necessary, clean the sensors with a specialized cleaner or replace them if they are faulty.
• Reinstall the sensors and reconnect the wiring harness.

3. Check and Replace Catalytic Converter (if needed)

• Raise the vehicle using a jack and secure it with jack stands.
• Remove the bolts securing the catalytic converter to the exhaust system using a socket set.
• Inspect the catalytic converter for blockage or damage.
• If replacement is necessary, install a new catalytic converter, ensuring proper alignment.

4. Clear Codes and Test Drive

• Reconnect the battery.
• Use the OBD-II scanner to clear the P0420 code.
• Start the engine and allow it to reach operating temperature.
• Take the vehicle for a test drive to confirm that the code does not reappear.