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

Solution

1. Preparation

• Gather tools and parts.
• Disconnect the battery to avoid any electrical shorts during repairs.

2. Inspect and Replace Oxygen Sensors

1. Locate the Oxygen Sensors: Identify the pre-catalytic and post-catalytic oxygen sensors in the exhaust system.
2. Remove the Sensors: Use an oxygen sensor socket to unscrew and remove the sensors from their respective locations.
3. Inspect Wiring: Check the wiring harness for signs of wear, corrosion, or damage. Repair or replace as necessary.
4. Install New Sensors: Install the new oxygen sensors, ensuring they are tightened to the manufacturer's torque specifications (typically around 30 ft-lbs).

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

1. Remove Exhaust Components: Unbolt and remove the exhaust pipe sections leading to the catalytic converter. Use penetrating oil if necessary to loosen rusted bolts.
2. Remove the Catalytic Converter: Unscrew the bolts securing the catalytic converter. Carefully remove it from the exhaust system.
3. Install New Catalytic Converter: Place the new catalytic converter in position and secure it with the bolts, torquing to manufacturer's specifications (usually around 30-40 ft-lbs).
4. Reattach Exhaust Components: Reconnect all exhaust sections and ensure there are no leaks.

4. Reconnect Battery and Clear Codes

1. Reconnect Battery: Reattach the negative battery terminal.
2. Clear Codes: Use an OBD-II scanner to clear the P0420 code from the system.