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

Solution

1. Preparation

• Gather tools and parts needed for the repair.
• Disconnect the battery to ensure safety while working on the vehicle.
• Raise the vehicle using a jack and secure it with jack stands.

2. Inspect and Replace Oxygen Sensors (if faulty)

• Tools Required: O2 sensor socket, ratchet, torque wrench.
• Remove the upstream oxygen sensor by disconnecting the electrical connector and unscrewing it from the exhaust manifold.
• Install the new upstream oxygen sensor and torque it to manufacturer specifications (typically around 30 lb-ft).
• Repeat the process for the downstream oxygen sensor if necessary.

3. Inspect and Replace the Catalytic Converter (if required)

• Tools Required: Socket set, cutting torch or saw (if necessary), gaskets, exhaust paste.
• Remove the exhaust pipes connected to the catalytic converter by unbolting the flanges.
• If the catalytic converter is welded in place, use a cutting torch or saw to carefully remove it.
• Install the new catalytic converter using new gaskets. Ensure all bolts are tightened to the specified torque.
• Reconnect the exhaust pipes and secure them properly.

4. Clear Codes and Test

• Reconnect the battery and use an OBD-II scanner to clear the P0420 code.
• Start the engine and allow it to reach operating temperature.
• Take the vehicle for a test drive to see if the check engine light reappears.