my Toyota RAV4 Fifth Generation (2019-present) has a check engine light and code P0420 what do I do

Solution

1. Preparation

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

2. Inspect and Replace Oxygen Sensors

• Tools Required: O2 sensor socket, torque wrench, multimeter.
• Sub-steps:
  1. Locate the upstream (pre-catalytic converter) and downstream (post-catalytic converter) oxygen sensors.
  2. Disconnect the electrical connectors from both sensors.
  3. Remove the sensors using the O2 sensor socket.
  4. Check the wiring for damage; replace any damaged wiring.
  5. Install the new oxygen sensors, tightening them to the manufacturer's specified torque (usually around 30 lb-ft).
  6. Reconnect the electrical connectors.

3. Inspect and Clean or Replace Catalytic Converter

• Tools Required: Wrench set, socket set, exhaust pipe cutter (if necessary).
• Sub-steps:
  1. Inspect the catalytic converter for physical damage and signs of blockage.
  2. If blockage is suspected, remove it by loosening the exhaust clamps (if applicable).
  3. Check for any rattling noises indicating internal failure.
  4. If the catalytic converter is clogged or damaged, replace it with a new unit.
  5. If cleaning is feasible, use a catalytic converter cleaner per the product instructions.

4. Reconnect Battery and Clear Codes

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