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 prevent electrical issues.
• Allow the exhaust system to cool before beginning work.

2. Inspect and Replace Oxygen Sensors

1. Locate the oxygen sensors: Identify the upstream and downstream oxygen sensors on the exhaust system.
2. Remove the sensors: Use an O2 sensor socket and ratchet to remove the sensors from their locations. Be cautious of any wiring.
3. Install new sensors: Apply anti-seize compound to the threads of the new sensors and install them. Torque to manufacturer specifications (usually around 30 ft-lbs).
4. Reconnect wiring: Ensure the electrical connectors are securely attached.

3. Inspect and Replace Catalytic Converter

1. Remove the old catalytic converter: Use a socket set to unbolt the catalytic converter from the exhaust pipes. Be prepared for rust and corrosion.
2. Install the new catalytic converter: Position the new converter in place and bolt it securely. Follow torque specifications (usually around 30-40 ft-lbs).
3. Check for leaks: After installation, inspect the connections to ensure there are no exhaust leaks.

4. Clear Codes and Test

1. Reconnect the battery: Ensure all connections are secure before reconnecting.
2. Clear the P0420 code: Use the OBD-II scanner to erase the trouble code from the vehicle’s computer.
3. Take the vehicle for a test drive: Drive for at least 20 minutes under various conditions to ensure the code does not reappear.