how to fix P0420 code on Toyota Camry Seventh Generation (2012-2017)

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the battery to prevent electrical shorts during the repair.
• Allow the engine to cool completely.

2. Inspect and Replace Oxygen Sensors

1. Locate Oxygen Sensors: Identify the upstream (pre-catalytic converter) and downstream (post-catalytic converter) oxygen sensors.
2. Remove Exhaust O2 Sensors: Use an oxygen sensor socket to carefully unscrew the sensors from the exhaust system.
3. Inspect Sensors: Check for signs of contamination or damage. If found, proceed to replace.
4. Install New Sensors: Apply anti-seize compound to the threads of new sensors, then install and torque to manufacturer specifications (usually around 30 lb-ft).
5. Reconnect Electrical Connectors: Ensure all connectors are secure.

3. Inspect and Replace Catalytic Converter (if necessary)

1. Remove Exhaust Components: If the catalytic converter is deemed faulty, detach any bolts and clamps securing the exhaust components leading to the converter.
2. Remove Catalytic Converter: Carefully unbolt the catalytic converter from the exhaust manifold and exhaust pipe.
3. Install New Catalytic Converter: Position the new catalytic converter, ensuring proper alignment with exhaust pipes. Use new gaskets if required.
4. Tighten Bolts: Torque all bolts to manufacturer specifications (typically 20-25 lb-ft for exhaust bolts).

4. Reconnect Battery

• Reconnect the battery terminals and ensure they are tight.

5. Clear Codes and Test Drive

• Use the OBD-II scanner to clear the P0420 code and take the vehicle for a test drive to monitor for any reoccurrence of the check engine light.