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

Solution

1. Preparation

• Gather all necessary tools and parts.
• Disconnect the battery to avoid any electrical shorts.
• Allow the engine to cool completely before starting work.

2. Inspect and Replace Oxygen Sensors

• Tools Required: O2 sensor socket, torque wrench.
• Remove the upstream and downstream oxygen sensors using the O2 sensor socket.
• Inspect the sensors for contamination or damage. Replace if necessary.
• Install the new sensors and torque them to manufacturer specifications (usually around 30 ft-lbs).

3. Check and Replace the Catalytic Converter

• Tools Required: Wrench set, jack and jack stands or a lift, gasket scraper.
• Raise the vehicle securely using jack stands.
• Remove the exhaust pipe or manifold bolts securing the catalytic converter.
• Carefully detach the catalytic converter from the exhaust system.
• Inspect the old catalytic converter for signs of damage or clogging.
• Clean the mounting surfaces on the exhaust system.
• Install the new catalytic converter and secure it with the bolts, tightening them to the manufacturer’s torque specifications (usually around 30-40 ft-lbs).
• Replace any gaskets or seals as necessary.

4. Reset the Engine Control Module

• Reconnect the battery after all repairs are completed.
• Use the OBD-II scanner to clear the P0420 code from the ECM.
• Start the engine and allow it to reach operating temperature.