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

Solution

1. Preparation

• Tools Required: OBD-II scanner, multimeter, socket set, torque wrench, backpressure gauge.
• Disconnect the vehicle's battery to prevent any electrical shorts.
• Allow the exhaust system to cool before starting work.

2. Inspect and Replace Oxygen Sensors

• Sub-steps:
  1. Locate the upstream (pre-catalytic converter) and downstream (post-catalytic converter) oxygen sensors.
  2. Disconnect the electrical connectors for both oxygen sensors.
  3. Remove the sensors using the appropriate socket (usually a 22mm O2 sensor socket).
  4. Install new sensors in reverse order and torque to the manufacturer's specifications (typically around 30 lb-ft).

3. Inspect and Replace the Catalytic Converter

• Sub-steps:
  1. Support the vehicle on jack stands securely.
  2. Remove the exhaust pipe connected to the catalytic converter using a socket set.
  3. Unbolt the catalytic converter from its mounting brackets and remove it from the exhaust system.
  4. Install the new catalytic converter, ensuring proper alignment.
  5. Reattach the exhaust pipe and torque bolts to the recommended specifications (usually around 30 lb-ft).

4. Clear Codes and Test Drive

• Sub-steps:
  1. Reconnect the vehicle's battery.
  2. Use the OBD-II scanner to clear the P0420 code from the vehicle's memory.
  3. Test drive the vehicle under various conditions to ensure the issue is resolved.