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

Solution

1. Preparation

• Gather tools and parts needed for repair.
• Disconnect the negative battery terminal to ensure safety while working.

2. Inspect and Replace Oxygen Sensors

1. Locate the pre-catalytic and post-catalytic oxygen sensors.
2. Use an O2 sensor socket to remove the old oxygen sensors.
3. Install new oxygen sensors, ensuring they are tightened to manufacturer specifications (typically around 30-40 ft-lbs).
4. Reconnect the electrical connectors securely.

3. Examine and Replace the Catalytic Converter (if needed)

1. Inspect the catalytic converter for any signs of damage or clogs.
2. If replacement is necessary, loosen and remove the bolts/nuts securing the catalytic converter to the exhaust system using a socket set.
3. Remove the old catalytic converter and install the new one, ensuring all gaskets are in place.
4. Torque the bolts/nuts to the vehicle manufacturer’s specifications (usually around 25-35 ft-lbs).
5. Reconnect any exhaust hangers or brackets.

4. Clearing the Code

1. Reconnect the negative battery terminal.
2. Use the OBD-II scanner to clear the error codes from the vehicle's computer.
3. Start the engine and allow it to reach operating temperature.