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

Solution

1. Preparation

• Gather necessary tools and parts.
• Ensure the vehicle is parked on a level surface and the engine is cool.
• Disconnect the battery to avoid any electrical issues.

2. Replace Oxygen Sensors (if necessary)

1. Locate the upstream and downstream oxygen sensors in the exhaust system.
2. Use an O2 sensor socket to remove the faulty sensor.
3. Apply anti-seize compound to the threads of the new oxygen sensor.
4. Install the new sensor and tighten it to the manufacturer's specification (usually around 30-40 lb-ft).
5. Reconnect the electrical connector.

3. Inspect and Replace Catalytic Converter (if necessary)

1. Remove any heat shields or covers that obstruct access to the catalytic converter.
2. Use a socket set to remove the bolts securing the catalytic converter to the exhaust system.
3. Carefully remove the catalytic converter and inspect it for damage or clogging.
4. Install the new catalytic converter, ensuring proper alignment with the exhaust system.
5. Torque the mounting bolts to the manufacturer's specifications (typically around 30-35 lb-ft).
6. Reinstall any heat shields or covers.

4. Reconnect Battery and Clear Codes

1. Reconnect the battery terminals ensuring a secure connection.
2. Use the OBD-II scanner to clear the P0420 code from the vehicle's computer.