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

Solution

1. Preparation

• Ensure the vehicle is securely parked on a flat surface.
• Disconnect the negative battery terminal to prevent electrical shorts.

2. Inspect and Replace Oxygen Sensors

• Tools Required: O2 sensor socket, wrench, multimeter
• If oxygen sensors are faulty:
  1. Locate the pre-catalytic and post-catalytic oxygen sensors.
  2. Use an O2 sensor socket to remove both sensors from their respective locations.
  3. Install new oxygen sensors, ensuring they are properly torqued (usually around 30 ft-lbs).
  4. Reconnect the electrical connectors.

3. Check and Replace Catalytic Converter (if necessary)

• Tools Required: Socket set, torque wrench, exhaust pipe cutter (if needed)
• If the catalytic converter is damaged:
  1. Remove the exhaust pipe bolts connecting to the catalytic converter using a socket set.
  2. If necessary, cut the exhaust pipe using the exhaust pipe cutter to remove the old catalytic converter.
  3. Install the new catalytic converter in place, ensuring proper alignment.
  4. Torque all bolts to the manufacturer’s specifications (typically around 25 ft-lbs).
  5. Reconnect the exhaust system, ensuring there are no leaks.

4. Reset the Engine Control Module (ECM)

• Reconnect the negative battery terminal.
• Use the OBD-II scanner to clear the P0420 code from the ECM.