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

Solution

1. Preparation

• Gather necessary tools and parts.
• Ensure the vehicle is parked on a level surface and the engine is cool.
• Disconnect the negative battery terminal to prevent electrical shorts.

2. Inspect and Replace Oxygen Sensors

• Tools Required: O2 sensor socket, ratchet, torque wrench.
• Remove the upstream oxygen sensor by using an O2 sensor socket to unscrew it.
• Install the new upstream oxygen sensor and torque it to the manufacturer's specifications (typically around 30 ft-lbs).
• Repeat the process for the downstream oxygen sensor if necessary.

3. Check and Replace the Catalytic Converter (if needed)

• Tools Required: Socket set, jack and jack stands, exhaust pipe cutter.
• Raise the vehicle using a jack and secure it with jack stands.
• Inspect the catalytic converter for any signs of damage or blockage.
• If replacement is needed, remove the exhaust pipes connected to the catalytic converter using a socket set.
• Cut the exhaust pipe if necessary and remove the old catalytic converter.
• Install the new catalytic converter, ensuring proper alignment with exhaust pipes, and secure it with the bolts.
• Reconnect any exhaust hangers and check for proper clearance.

4. Clear Error Codes

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