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

Solution

1. Preparation

• Tools Required: OBD-II scanner, multimeter, temperature gauge, socket set, jack and jack stands.
• Disconnect the battery to ensure safety during repairs.
• Raise the vehicle using a jack and secure it with jack stands.

2. Inspect and Replace Oxygen Sensors (if faulty)

• Sub-steps:
  1. Locate the upstream (pre-catalytic converter) and downstream (post-catalytic converter) oxygen sensors.
  2. Use a socket wrench to remove the faulty oxygen sensors.
  3. Install new oxygen sensors by reversing the removal process, ensuring they are properly torqued to manufacturer specifications (typically around 30 Nm).
  4. Reconnect any electrical connectors.

3. Inspect and Replace Catalytic Converter (if necessary)

• Sub-steps:
  1. Remove the exhaust pipes connected to the catalytic converter using a socket set.
  2. Unbolt the catalytic converter from its mounting points.
  3. Compare the replacement catalytic converter with the old one to ensure compatibility.
  4. Install the new catalytic converter, tightening bolts to the specified torque (usually around 40-50 Nm).
  5. Reattach the exhaust pipes securely with clamps.

4. Clear Codes and Recheck

• Sub-steps:
  1. Reconnect the battery.
  2. Use the OBD-II scanner to clear the P0420 code from the vehicle's computer.
  3. Start the engine and monitor for any reoccurring codes.