how to fix P0420 code on my Toyota RAV4 XA40 (2013-2018)

Solution

1. Preparation

• Gather required tools and parts, and ensure the vehicle is parked on a level surface.
• Disconnect the battery to prevent any electrical issues while working.

2. Inspect and Replace Oxygen Sensors

• Tools Required: O2 sensor socket, ratchet and extension, torque wrench.
• Remove the upstream oxygen sensor (bank 1) using the O2 sensor socket and replace it with a new one, tightening to the manufacturer's specifications (typically around 30 ft-lbs).
• Repeat the process for the downstream oxygen sensor if necessary.

3. Inspect and Replace Catalytic Converter (if needed)

• Tools Required: Socket set, jack and jack stands, exhaust pipe cutter or saw, new gaskets and bolts for installation.
• Safely lift the vehicle using a jack and secure it with jack stands.
• Remove any heat shields if necessary to access the catalytic converter.
• Cut or unbolt the existing catalytic converter from the exhaust system.
• Install the new catalytic converter with new gaskets and bolts, tightening to the specified torque values.
• Reattach any heat shields.

4. Reconnect Battery and Clear Codes

• Reconnect the negative battery terminal.
• Use the OBD-II scanner to clear any diagnostic trouble codes (DTCs) stored in the system.