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

Solution

1. Preparation

• Gather necessary tools and parts.
• Park the vehicle on a flat surface and engage the parking brake.
• Allow the engine to cool down.

2. Inspect and Replace Oxygen Sensors

• Tools Required: O2 sensor socket, ratchet, torque wrench.
• Sub-steps:
  1. Disconnect the negative battery terminal.
  2. Locate the pre-catalytic converter oxygen sensor and disconnect its electrical connector.
  3. Use the O2 sensor socket to remove the sensor; note its orientation for replacement.
  4. Install the new sensor, tightening it to the manufacturer’s specifications (typically around 30-40 lb-ft).
  5. Reconnect the electrical connector.

3. Inspect and Replace Catalytic Converter (if necessary)

• Tools Required: Socket set, jack and jack stands, torque wrench.
• Sub-steps:
  1. Raise the vehicle using the jack and secure it with jack stands.
  2. Inspect the catalytic converter for physical damage or blockages.
  3. If replacement is needed, disconnect the exhaust pipes on both sides of the catalytic converter.
  4. Remove the mounting bolts and carefully take out the old catalytic converter.
  5. Install the new catalytic converter, ensuring proper alignment and torque the bolts according to specifications.
  6. Reconnect the exhaust pipes and check for leaks.

4. Clear the Code

• Reconnect the negative battery terminal.
• Use the OBD-II scanner to clear the P0420 code from the ECM.