how to fix P0420 code on Toyota RAV4 Fifth Generation (2019-present)

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the vehicle battery to prevent electrical shorts.
• Ensure the vehicle is on a level surface and use jack stands for safety if needed.

2. Inspect and Replace Oxygen Sensors

• Tools Required: O2 sensor socket, ratchet, and torque wrench.
• Steps:
  1. Locate the pre-catalytic and post-catalytic oxygen sensors.
  2. Disconnect the electrical connectors from both sensors.
  3. Use the O2 sensor socket to remove the sensors from the exhaust system.
  4. Install new oxygen sensors and torque them to manufacturer specifications (typically around 30 lb-ft).
  5. Reconnect the electrical connectors.

3. Examine and Replace the Catalytic Converter

• Tools Required: Socket set, torque wrench, exhaust pipe cutter (if needed), and gasket scraper.
• Steps:
  1. Remove any heat shields covering the catalytic converter, if applicable.
  2. Disconnect the exhaust pipes connected to the catalytic converter using a socket set.
  3. If necessary, use an exhaust pipe cutter to remove the old catalytic converter.
  4. Clean the mating surfaces where the new catalytic converter will be installed.
  5. Install the new catalytic converter, ensuring proper alignment and sealing.
  6. Torque all bolts to manufacturer's specifications.

4. Reconnect Battery and Clear Codes

• Reconnect the vehicle battery.
• Use the OBD-II scanner to clear the P0420 code from the system.
• Start the engine and allow it to idle to check for any leaks or issues.