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

Solution

1. Preparation

• Gather all necessary tools and parts.
• Disconnect the vehicle's battery to ensure safety during repairs.
• Raise the vehicle using a jack and secure it with jack stands.

2. Inspect and Replace Oxygen Sensors

• Remove the upstream (pre-catalytic converter) oxygen sensor using an O2 sensor socket.
• Inspect the sensor for damage or contamination.
• If faulty, replace it with a new one, ensuring it is the correct type for the vehicle model.
• Repeat the process for the downstream (post-catalytic converter) oxygen sensor if testing shows it's malfunctioning.

3. Inspect and Replace Catalytic Converter

• Locate the catalytic converter in the exhaust system.
• Disconnect the exhaust pipes from the catalytic converter using a socket set, removing any bolts.
• Remove the catalytic converter from its mounting brackets.
• Install the new catalytic converter, ensuring proper alignment with exhaust pipes.
• Torque the bolts to manufacturer's specifications (usually around 30-40 ft-lbs).

4. Reconnect Battery and Clear Codes

• Reconnect the battery terminals securely.
• Use the OBD-II scanner to clear the P0420 code from the vehicle's computer system.
• Start the engine and let it run for a few minutes to ensure everything is operating correctly.