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

Solution

1. Preparation

• Gather all necessary tools and parts.
• Disconnect the negative terminal of the battery.
• Raise the vehicle securely on jack stands if required.

2. Inspect and Replace Oxygen Sensors

• Tools Required: O2 sensor socket, ratchet, torque wrench.
• Remove the upstream (pre-catalytic) oxygen sensor:
  1. Disconnect the wiring harness from the sensor.
  2. Use the O2 sensor socket to unscrew the sensor from the exhaust manifold.
  3. Install the new sensor by screwing it in and tightening it to the manufacturer's specification (typically around 30 ft-lbs).
  4. Reconnect the wiring harness.
• Repeat the process for the downstream (post-catalytic) oxygen sensor if necessary.

3. Inspect and Replace Catalytic Converter

• Tools Required: Socket set, exhaust pipe cutter (if needed), torque wrench.
• Remove the catalytic converter:
  1. Disconnect any hangers or brackets securing the catalytic converter.
  2. Unbolt the catalytic converter from the exhaust system using a socket set.
  3. If necessary, use an exhaust pipe cutter to make clean cuts.
• Install the new catalytic converter:
  1. Position the new catalytic converter in place and secure it using the original bolts and hardware.
  2. Ensure all connections are tight and sealed properly.
  3. Reinstall hangers or brackets to secure the converter.

4. Clear Codes and Test Drive

• Reconnect the negative battery terminal.
• Use the OBD-II scanner to clear the P0420 code.
• Start the engine and conduct a test drive to ensure the issue is resolved.