how to fix P0420 code in my Toyota Camry Seventh Generation (2012-2017)?

Solution

1. Preparation

• Gather all necessary tools and parts.
• Disconnect the negative terminal of the battery to avoid electrical shock.
• Allow the exhaust system to cool before working.

2. Inspect and Replace Oxygen Sensors

• Tools Required: O2 sensor socket, wrench set, multimeter.
• Sub-steps:
  1. Locate the upstream (pre-catalytic) and downstream (post-catalytic) oxygen sensors.
  2. Remove the upstream oxygen sensor using the O2 sensor socket.
  3. Inspect the sensor for damage; replace if necessary.
  4. Repeat the process for the downstream oxygen sensor.
  5. Reconnect the battery terminal after replacing the sensors.

3. Check and Replace Catalytic Converter (if necessary)

• Tools Required: Socket set, jack and jack stands, exhaust pipe cutter, new gaskets.
• Sub-steps:
  1. Raise the vehicle securely on jack stands.
  2. Inspect the catalytic converter for any cracks or signs of wear.
  3. If damaged, remove the bolts holding the catalytic converter in place.
  4. Cut any exhaust pipes as needed for removal (if applicable).
  5. Install the new catalytic converter using new gaskets and bolts; ensure proper torque specifications are followed.
  6. Reconnect any exhaust pipes if they were cut.

4. Clear the Codes

• Use the OBD-II scanner to clear the P0420 code from the vehicle's computer.
• Start the engine and allow it to reach operating temperature.