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

Solution

1. Preparation

• Gather necessary tools and parts.
• Ensure the vehicle is parked on a level surface and the engine is cool.
• Disconnect the battery to prevent electrical shorts.

2. Inspect and Replace Oxygen Sensors (if necessary)

• Tools Required: O2 sensor socket, wrench set, penetrating oil.
• Sub-steps:
  1. Locate the upstream and downstream oxygen sensors.
  2. Apply penetrating oil to the sensor threads to ease removal.
  3. Use the O2 sensor socket to remove the upstream sensor first.
  4. Install the new upstream oxygen sensor, tightening it to manufacturer specifications (typically around 30 lb-ft).
  5. Repeat the process for the downstream oxygen sensor if needed.

3. Inspect and Replace Catalytic Converter (if necessary)

• Tools Required: Socket set, jack stands, exhaust pipe cutter (if needed).
• Sub-steps:
  1. Raise the vehicle using a jack and secure it with jack stands.
  2. Remove any heat shields or mounting brackets obstructing access to the catalytic converter.
  3. Use an exhaust pipe cutter to remove the old catalytic converter.
  4. Install the new catalytic converter, ensuring all gaskets are intact and properly aligned.
  5. Tighten bolts to manufacturer specifications (usually around 25-30 lb-ft).

4. Reconnect Battery and Reset ECU

• Reconnect the battery terminals.
• Use the OBD-II scanner to clear the P0420 code from the ECU.
• Start the vehicle and allow it to reach operating temperature.