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

Solution

1. Preparation

• Gather tools and parts required for the repair.
• Disconnect the battery to prevent electrical shock.
• Raise the vehicle safely using jack stands.

2. Inspect and Replace Oxygen Sensors

• Sub-steps:
  1. Locate the upstream and downstream oxygen sensors connected to the exhaust system.
  2. Unplug the electrical connectors from both sensors.
  3. Use a socket wrench to unscrew the sensors from their mounting locations.
  4. Install new oxygen sensors, applying anti-seize compound to the threads.
  5. Tighten the sensors to the manufacturer’s specified torque (typically around 30-40 lb-ft).
  6. Reconnect the electrical connectors.

3. Examine and Replace Catalytic Converter (if needed)

• Sub-steps:
  1. Inspect the catalytic converter for any signs of physical damage or blockage.
  2. If replacement is necessary, unbolt the catalytic converter from the exhaust pipes using a socket set.
  3. Remove any heat shields or additional components obstructing access.
  4. Install the new catalytic converter, ensuring proper alignment with exhaust pipes.
  5. Secure with bolts and torque to manufacturer specifications.
  6. Reinstall any removed components or heat shields.

4. Reset the Engine Control Module (ECM)

• Sub-steps:
  1. Reconnect the battery.
  2. Use the OBD-II scanner to clear the P0420 code.
  3. Start the engine and allow it to reach operating temperature.