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

Solution

1. Preparation

• Gather tools and parts required for the repair.
• Disconnect the battery to ensure safety while working on the electrical components.
• Allow the exhaust system to cool down before inspection.

2. Inspect and Replace Oxygen Sensors

• Sub-steps:
  1. Locate the upstream and downstream oxygen sensors in the exhaust system.
  2. Use a wrench to unscrew the sensors from their respective locations.
  3. Inspect the threads for damage and clean if necessary.
  4. Install the new oxygen sensors and tighten them to the manufacturer’s specifications (usually around 30 lb-ft).
  5. Reconnect the electrical connectors to the sensors.

3. Inspect and Replace Catalytic Converter (if necessary)

• Sub-steps:
  1. Remove the bolts securing the catalytic converter to the exhaust pipe using a socket set.
  2. If applicable, remove the oxygen sensor from the catalytic converter.
  3. Inspect the inside of the catalytic converter for signs of clogging or damage.
  4. Install the new catalytic converter, ensuring proper alignment and sealing.
  5. Tighten the bolts to the manufacturer’s torque specifications (usually about 30 lb-ft).
  6. Reinstall the oxygen sensor if it was removed.

4. Reset the Check Engine Light

• Sub-steps:
  1. Reconnect the battery.
  2. Use the OBD-II scanner to clear the P0420 code from the system.
  3. Start the vehicle to ensure the check engine light is off.