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

Solution

1. Preparation

• Gather necessary tools and parts.
• Ensure the vehicle is parked on a flat surface and the engine is cool.
• Disconnect the negative battery terminal to prevent electrical shock.

2. Inspect and Replace Oxygen Sensors (if faulty)

• Tools Required: O2 sensor socket, wrench set, torque wrench
• Remove the O2 sensor(s) from the exhaust system.
  • Use the O2 sensor socket to unscrew the sensor(s) from the exhaust pipe.
  • Inspect the sensor for carbon build-up or damage.
• Install new O2 sensor(s).
  • Apply anti-seize compound on the threads of the new sensor.
  • Tighten to the manufacturer’s specifications (typically about 30 lb-ft).

3. Examine and Replace the Catalytic Converter (if necessary)

• Tools Required: Socket set, jack and jack stands, exhaust pipe cutter, torque wrench
• Remove the exhaust pipe connected to the catalytic converter.
  • Use the exhaust pipe cutter or saw to cut the pipe if it’s rusted or damaged.
• Detach the catalytic converter from the exhaust system.
  • Unscrew the bolts holding the catalytic converter in place using a socket set.
• Install the new catalytic converter.
  • Align the new converter with the exhaust system and secure it with bolts.
  • Use a torque wrench to tighten the bolts to the specified torque (refer to the vehicle’s service manual for specifications).

4. Reconnect Battery and Clear Codes

• Reconnect the negative battery terminal.
• Use the OBD-II scanner to clear the P0420 code and any other trouble codes.