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

Solution

1. Preparation

• Tools Required: OBD-II scanner, multimeter, jack and jack stands, thermal imaging camera or thermometer, socket set, torque wrench.
• Ensure the vehicle is parked on a flat surface and the engine is cool.
• Disconnect the battery to avoid any electrical shorts.

2. Inspect Oxygen Sensors

• Locate the upstream and downstream oxygen sensors.
• Use a socket wrench to remove the sensors.
• Inspect the sensors for any carbon buildup or physical damage.
• If they are faulty, replace them with new sensors.

3. Inspect and Replace the Catalytic Converter (if necessary)

• Tools Required: Socket set, torque wrench.
• Raise the vehicle using a jack and secure it with jack stands.
• Locate the catalytic converter and inspect it for damage or excessive carbon deposits.
• If replacement is needed:
  1. Unbolt the catalytic converter from the exhaust system using a socket wrench.
  2. Install the new catalytic converter and ensure it is securely fastened.
  3. Torque the bolts to the manufacturer's specifications (refer to service manual for specific torque values).

4. Clear Codes and Reconnect Battery

• Reconnect the battery terminals once repairs are complete.
• Use the OBD-II scanner to clear the P0420 code from the vehicle's computer.

5. Test Drive

• Conduct a test drive to ensure the repair was successful and the check engine light does not reappear.