how to fix P0420 code in Toyota Tacoma N300 (2016-Present)

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the vehicle battery.
• Allow the engine to cool down completely before starting work.

2. Remove the Catalytic Converter

• Tools Required: Socket set, ratchet, torque wrench, penetrating oil.
• Sub-steps:
  1. Raise the vehicle using a jack and secure it with jack stands.
  2. Apply penetrating oil to the bolts securing the catalytic converter to the exhaust system and allow it to sit for a few minutes.
  3. Remove the bolts connecting the catalytic converter to the exhaust pipe and exhaust manifold using the socket set.
  4. Carefully detach the catalytic converter from the vehicle.

3. Inspect and Replace Oxygen Sensors

• Tools Required: O2 sensor socket, wrench.
• Sub-steps:
  1. Locate the pre-catalytic and post-catalytic oxygen sensors.
  2. Use the O2 sensor socket to remove the old sensors.
  3. Install the new oxygen sensors and tighten them to the specified torque (typically around 30 ft-lbs).

4. Install New Catalytic Converter

• Tools Required: Torque wrench.
• Sub-steps:
  1. Position the new catalytic converter in place and align it with the exhaust system.
  2. Secure it using the original bolts, tightening them to the manufacturer's specified torque (usually around 40 ft-lbs).

5. Reconnect Battery and Clear Codes

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