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

Solution

1. Preparation

• Gather all necessary tools and parts.
• Disconnect the battery to prevent electrical shorts.
• Allow the exhaust system to cool before beginning work.

2. Inspect and Replace Oxygen Sensors

• Tools Required: O2 sensor socket, wrench set
• Sub-steps:
  1. Locate the pre-catalytic and post-catalytic oxygen sensors beneath the vehicle.
  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, torquing them to the manufacturer's specifications (typically around 30 lb-ft).
  5. Reconnect the electrical connectors.

3. Inspect and Replace Catalytic Converter

• Tools Required: Jack and jack stands, wrench set, exhaust pipe cutter or saw, gasket scraper
• Sub-steps:
  1. Raise the vehicle securely using jack stands.
  2. Locate the catalytic converter and examine it for physical damage or blockage.
  3. If replacement is needed, use the exhaust pipe cutter to cut the exhaust pipes connected to the catalytic converter.
  4. Remove the catalytic converter from its mounting brackets.
  5. Clean the mating surfaces on the exhaust pipes using a gasket scraper to ensure a good seal.
  6. Install the new catalytic converter, ensuring all fittings and gaskets are properly aligned.
  7. Reattach the exhaust pipes and secure all connections.

4. Reconnect Battery and Clear Codes

• Sub-steps:
  1. Reconnect the battery terminals.
  2. Use the OBD-II scanner to clear any error codes from the vehicle’s computer.

5. Test Drive

• Perform a test drive to ensure the vehicle operates normally and the check engine light does not reappear.