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

Solution

1. Preparation

• Tools Required: OBD-II scanner, multimeter, jack and jack stands, socket set, torque wrench, safety goggles.
• Disconnect the battery to ensure safety while working on electrical components.

2. Inspect and Replace Oxygen Sensors (if faulty)

• Sub-steps:
  1. Locate the upstream and downstream oxygen sensors.
  2. Unplug the electrical connectors from both sensors.
  3. Use a socket wrench to remove the sensors from the exhaust system.
  4. Install new sensors by screwing them into place and tightening them to the manufacturer's specifications (usually around 30-40 lb-ft).
  5. Reconnect the electrical connectors.

3. Inspect and Replace Catalytic Converter (if necessary)

• Sub-steps:
  1. Raise the vehicle using a jack and secure it with jack stands.
  2. Locate the catalytic converter in the exhaust system.
  3. Unbolt the catalytic converter from the exhaust pipes using the socket set.
  4. Remove the old catalytic converter and install the new one, ensuring correct orientation.
  5. Reattach all bolts and nuts, tightening them to the specified torque values (usually around 30-40 lb-ft).

4. Clear Codes and Test

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

5. Check for Leaks

• Sub-steps:
  1. Inspect the exhaust system visually for any leaks around joints and connections.
  2. Listen for any exhaust noise that may indicate a leak.