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

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the battery to avoid electrical shorts.
• Ensure the vehicle is on a flat surface and secure it with wheel chocks.

2. Check and Replace Oxygen Sensors

• Tools Required: O2 sensor socket, ratchet, torque wrench
• Sub-steps:
  1. Locate the upstream and downstream oxygen sensors.
  2. Use the O2 sensor socket to carefully remove both sensors.
  3. Inspect the sensors for damage or contamination.
  4. Install new oxygen sensors, tightening them to the manufacturer's specifications (typically around 30-34 lb-ft).
  5. Reconnect any electrical connectors.

3. Inspect and Replace Catalytic Converter

• Tools Required: Socket set, jack and jack stands, exhaust pipe cutter (if necessary), gasket scraper
• Sub-steps:
  1. Raise the vehicle using a jack and secure it on jack stands.
  2. Remove any heat shields or brackets obstructing access to the catalytic converter.
  3. Cut the exhaust pipe if necessary to remove the old converter, ensuring to wear safety goggles.
  4. Clean the mounting surfaces with a gasket scraper to ensure a proper seal for the new converter.
  5. Install the new catalytic converter, ensuring the gaskets are aligned properly.
  6. Reattach any heat shields or brackets removed earlier.

4. Final Checks

• Tools Required: Torque wrench
• Sub-steps:
  1. Reconnect the battery terminals.
  2. Start the engine and let it idle for a few minutes.
  3. Check for exhaust leaks around the new installation by feeling for air movement.
  4. Clear the P0420 code using the OBD-II scanner.