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

Solution

1. Preparation

• Gather tools and parts needed for the repair.
• Ensure the vehicle is parked on a flat surface and the engine is cool.
• Disconnect the battery to avoid electrical shorts.

2. Replace Faulty Oxygen Sensors

1. Locate the oxygen sensors: Find the upstream and downstream oxygen sensors on the exhaust manifold and catalytic converter.
2. Remove the sensors: Use an oxygen sensor socket to unscrew and disconnect the sensors from the wiring harness.
3. Install new sensors: Apply anti-seize compound to the threads of the new sensors and install them, tightening to the manufacturer's specifications (typically around 30 lb-ft).
4. Reconnect the wiring harness: Ensure connections are secure and free of corrosion.

3. Inspect and Replace the Catalytic Converter

1. Remove the exhaust components: If the catalytic converter is suspected to be faulty, remove any necessary exhaust components (such as pipes and heat shields) using a socket set.
2. Inspect the catalytic converter: Check for physical damage or blockage. If damaged, proceed to replace.
3. Install a new catalytic converter: Position the new catalytic converter and secure it with the appropriate bolts. Use a torque wrench to tighten bolts to the specified torque (usually around 30-40 lb-ft).
4. Reassemble the exhaust system: Reattach any removed components ensuring all connections are sealed properly.

4. Clear Error Codes

1. Reconnect the battery: Once all repairs are completed, reconnect the battery.
2. Use the OBD-II scanner: Clear the error codes and reset the check engine light.