how to fix P0420 code on my Toyota RAV4 Fourth Generation (2013-2018)

Solution

1. Preparation

• Tools Required: OBD-II scanner, multimeter, infrared thermometer, socket set, jack and jack stands.
• Disconnect the negative battery terminal to prevent electrical shorts.
• Raise the vehicle using a jack and secure it on jack stands for safety.

2. Inspect and Replace Oxygen Sensors

• Sub-steps:
  1. Locate the pre-catalytic and post-catalytic oxygen sensors.
  2. Disconnect the electrical connectors from the sensors.
  3. Remove the sensors using an oxygen sensor socket.
  4. Install new oxygen sensors, ensuring they are tightened to the manufacturer’s specifications (typically 30-40 lb-ft).
  5. Reconnect the electrical connectors for the oxygen sensors.

3. Replace the Catalytic Converter

• Sub-steps:
  1. Remove any heat shields or brackets securing the catalytic converter.
  2. Unbolt the catalytic converter from the exhaust system using the socket set.
  3. Inspect the exhaust pipes for damage or corrosion; replace if necessary.
  4. Install the new catalytic converter by reversing the removal steps, ensuring all bolts are tightened to manufacturer specifications.
  5. Reattach any heat shields or brackets.

4. Reset the Engine Control Module (ECM)

• Sub-steps:
  1. Reconnect the negative battery terminal.
  2. Use the OBD-II scanner to clear the P0420 code from the ECM.
  3. Start the engine and allow it to reach operating temperature.