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

Solution

1. Preparation

• Gather the necessary tools and parts.
• Ensure the vehicle is parked on a level surface, and the engine is cool.
• Disconnect the battery to prevent electrical shorts.

2. Inspect and Replace O2 Sensors

• Tools Required: O2 sensor socket, ratchet, torque wrench, penetrating oil.
• Remove the upstream (pre-catalytic converter) O2 sensor:
  1. Apply penetrating oil to the O2 sensor threads if rusted.
  2. Use the O2 sensor socket to unscrew and remove the sensor.
  3. Install the new O2 sensor by threading it into place and tightening to manufacturer specifications (typically around 30 ft-lbs).
• Repeat the procedure for the downstream (post-catalytic converter) O2 sensor if it shows poor performance.

3. Inspect and Replace the Catalytic Converter (if necessary)

• Tools Required: Socket set, torque wrench, exhaust gasket.
• If the catalytic converter is damaged or not functioning:
  1. Remove any exhaust hangers or brackets securing the catalytic converter.
  2. Unscrew the bolts connecting the catalytic converter to the exhaust system using a socket set.
  3. Remove the old catalytic converter and replace it with a new one, ensuring proper alignment.
  4. Reinstall all bolts and hangers, tightening them to manufacturer specifications.
  5. Replace the exhaust gasket to ensure a proper seal.

4. Reconnect Battery and Clear Codes

• Reconnect the battery terminals ensuring a secure connection.
• Use the OBD-II scanner to clear the P0420 code from the vehicle’s memory.