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

Solution

1. Preparation

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

2. Inspect and Replace Oxygen Sensors

• Sub-step 1: Locate the upstream and downstream oxygen sensors.
• Sub-step 2: Using a socket wrench, remove the upstream oxygen sensor.
• Sub-step 3: Install the new upstream oxygen sensor and tighten it to the manufacturer's specifications (typically 30 ft-lbs).
• Sub-step 4: Repeat the procedure for the downstream oxygen sensor.

3. Inspect and Replace Catalytic Converter

• Sub-step 1: Remove the bolts securing the catalytic converter to the exhaust system using a socket set.
• Sub-step 2: Carefully detach the catalytic converter from the exhaust pipe.
• Sub-step 3: Inspect the mounting surfaces for damage; clean if necessary.
• Sub-step 4: Install the new catalytic converter, ensuring it is aligned properly.
• Sub-step 5: Reinstall and tighten the mounting bolts to the specified torque (typically 40-50 ft-lbs).

4. Reset the Engine Control Module (ECM)

• Sub-step 1: Reconnect the battery.
• Sub-step 2: Use the OBD-II scanner to clear the P0420 code from the ECM.
• Sub-step 3: Start the engine and allow it to idle for a few minutes to ensure the system initializes correctly.