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

Solution

1. Preparation

• Gather necessary tools and parts.
• Ensure the vehicle is on a flat surface and secure it with wheel chocks.
• Disconnect the battery to prevent electrical shock during repairs.

2. Inspect and Replace Oxygen Sensors

• Sub-steps:
  • Locate the upstream and downstream oxygen sensors.
  • Disconnect the electrical connectors from both sensors.
  • Use a wrench to remove the sensors from the exhaust system.
  • Install new oxygen sensors, ensuring they are tightened to the manufacturer’s torque specification (typically 30 ft-lbs).
  • Reconnect the electrical connectors.

3. Inspect and Replace the Catalytic Converter

• Sub-steps:
  • Remove any heat shields if necessary.
  • Unbolt the catalytic converter from the exhaust system using a socket set.
  • Inspect the exhaust manifold and pipe connections for damage or rust.
  • Install the new catalytic converter, ensuring proper alignment and sealing.
  • Torque the bolts to the manufacturer's specifications (usually around 25-30 ft-lbs).
  • Reinstall heat shields.

4. Clear the Codes

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