how to fix P0420 code on Toyota RAV4 Fifth Generation (2019-present)

Solution

1. Preparation

• Gather tools and parts.
• Disconnect the battery to prevent electrical shorts.
• Ensure the vehicle is on a flat surface and secured with wheel chocks.

2. Inspect and Replace Oxygen Sensors

• Tools Required: O2 sensor socket, ratchet, torque wrench.
• Sub-steps:
  1. Remove the upstream oxygen sensor (before the catalytic converter) by using the O2 sensor socket and ratchet.
  2. Install the new upstream oxygen sensor and torque to manufacturer's specifications (usually around 30 lb-ft).
  3. Repeat the process for the downstream oxygen sensor (after the catalytic converter) if applicable.

3. Inspect and Replace the Catalytic Converter

• Tools Required: Socket set, torque wrench, exhaust hanger removal tool.
• Sub-steps:
  1. Remove any exhaust clamps or bolts securing the catalytic converter to the exhaust system.
  2. Disconnect the catalytic converter from the exhaust pipes with the socket set.
  3. Remove any exhaust hangers using the exhaust hanger removal tool.
  4. Install the new catalytic converter by reversing the removal steps and ensuring all connections are tight.
  5. Torque all bolts to the manufacturer's specifications.

4. Reconnect Battery and Clear Codes

• Reconnect the battery terminals.
• Use the OBD-II scanner to clear the P0420 code and any other related codes from the system.