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

Solution

1. Preparation

• Gather all necessary tools and parts.
• Ensure the vehicle is on a flat surface and securely lifted with jack stands if necessary.
• Disconnect the battery to prevent any electrical issues.

2. Replace Oxygen Sensors (if faulty)

• Tools Required: O2 sensor socket, wrench set, penetrating oil
• Sub-steps:
  1. Locate the upstream (pre-catalytic) and downstream (post-catalytic) oxygen sensors.
  2. Apply penetrating oil to the sensor threads and wait a few minutes.
  3. Disconnect the electrical connector from each sensor.
  4. Use an O2 sensor socket to unscrew the faulty sensor.
  5. Install the new sensor by threading it into the exhaust system and tightening it to the manufacturer’s specifications (usually around 30 lb-ft).
  6. Reconnect the electrical connectors securely.

3. Replace Catalytic Converter (if necessary)

• Tools Required: Socket set, exhaust hanger removal tool, cutting tool (if needed)
• Sub-steps:
  1. Remove the oxygen sensors from the catalytic converter if they haven't already been removed.
  2. Unbolt the catalytic converter from the exhaust system using a socket set.
  3. If the converter is welded, use a cutting tool to remove it carefully.
  4. Install the new catalytic converter by positioning it and securing it with bolts to the exhaust system.
  5. Reinstall the oxygen sensors in their respective positions.

4. Reconnect Battery and Clear Codes

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