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

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the battery to avoid any electrical issues.
• Raise the vehicle using jack stands for access to the exhaust system.

2. Inspect and Replace Oxygen Sensors

• Sub-steps:
  1. Locate the upstream (pre-catalytic converter) and downstream (post-catalytic converter) oxygen sensors.
  2. Disconnect the electrical connectors from both sensors.
  3. Use an oxygen sensor socket to remove the sensors from the exhaust pipe.
  4. Install the new oxygen sensors in the reverse order of removal, ensuring they are securely tightened (typically to 30 lb-ft).
  5. Reconnect the electrical connectors.

3. Inspect and Replace Catalytic Converter

• Sub-steps:
  1. Remove the exhaust pipes connected to the catalytic converter by loosening the flange bolts and any clamps.
  2. If necessary, remove any heat shields covering the catalytic converter.
  3. Unbolt the catalytic converter from its mounting points.
  4. Install the new catalytic converter, ensuring proper alignment and securing it with the original or new hardware (torque to manufacturer specifications).
  5. Reattach the exhaust pipes and clamps, ensuring no leaks are present.

4. Reconnect Battery and Clear Codes

• Reconnect the battery terminals.
• Use the OBD-II scanner to clear the P0420 code from the vehicle’s computer.