how to fix P0420 code on my Toyota RAV4 XA50 (2019-2024)

Solution

1. Preparation

• Gather all necessary tools and components.
• Disconnect the battery to prevent any electrical issues while working on the vehicle.

2. Inspect and Replace Oxygen Sensors

• Tools Required: O2 sensor socket, wrench set, torque wrench
  • a. Locate the upstream and downstream oxygen sensors.
  • b. Disconnect the electrical connectors from both sensors.
  • c. Remove the sensors using the O2 sensor socket.
  • d. Install new oxygen sensors and torque to manufacturer specifications (usually around 30 ft-lbs).
  • e. Reconnect the electrical connectors.

3. Inspect and Replace Catalytic Converter (if necessary)

• Tools Required: Socket set, jack and jack stands, cutting tool (if needed), new gaskets
  • a. Lift the vehicle securely using jack and jack stands.
  • b. Remove the exhaust pipes connected to the catalytic converter using the socket set.
  • c. Inspect the catalytic converter for physical damage, such as rust or rattling sounds.
  • d. If replacement is necessary, cut the old catalytic converter out if it is welded in place, or unbolt it if it is clamped.
  • e. Install the new catalytic converter with new gaskets and torque the bolts to the manufacturer's specifications.

4. Clear Codes and Test Drive

• Tools Required: OBD-II scanner
  • a. Reconnect the battery.
  • b. Use the OBD-II scanner to clear the P0420 code.
  • c. Start the engine and perform a test drive to ensure the check engine light does not reappear.