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

Solution

1. Preparation

• Gather all necessary tools and parts.
• Disconnect the battery to avoid electrical shorts.
• Allow the vehicle to cool before working on the exhaust system.

2. Inspect and Replace Oxygen Sensors (if necessary)

• Tools Required: O2 sensor socket, wrench
• Remove the upstream oxygen sensor using the O2 sensor socket.
• Inspect the sensor for damage or contamination.
• If damaged, install a new upstream oxygen sensor and torque to manufacturer specifications (typically around 30 ft-lbs).
• Repeat the process for the downstream oxygen sensor if it was found faulty.

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

• Tools Required: Socket set, torque wrench, exhaust gasket
• Remove the exhaust pipe connected to the catalytic converter. Use the socket set to unbolt the flanges.
• Inspect the catalytic converter for any physical damage or blockage. If it appears damaged or clogged, replace it.
• Install the new catalytic converter using a new exhaust gasket. Torque bolts to manufacturer specifications (typically around 25 ft-lbs).

4. Reset the Engine Control Module (ECM)

• Reconnect the battery and start the vehicle.
• Use the OBD-II scanner to clear the P0420 code from the ECM.

5. Final Inspection

• Inspect for exhaust leaks around the new components.
• Ensure all connections are secure.