how to tell if my Toyota Tacoma N300 (2016-Present) catalytic converter is bad

Solution

1. Preparation

• Tools Required: OBD-II scanner, jack and jack stands, safety glasses, gloves, exhaust backpressure gauge, thermometer.
• Ensure the vehicle is parked on a flat surface and the parking brake is engaged.
• Disconnect the battery to avoid any electrical shorts.

2. Remove the Catalytic Converter

1. Lift the Vehicle: Use a jack and jack stands to safely elevate the vehicle.
2. Locate the Catalytic Converter: Identify the catalytic converter under the vehicle between the exhaust manifold and the muffler.
3. Unbolt the Exhaust Flanges:
   • Use a socket set to remove bolts from the exhaust flanges connecting the catalytic converter to the exhaust manifold and the mid-pipe.
   • If bolts are rusted, apply penetrating oil and allow it to soak before attempting to remove them.
4. Support the Converter: Use a jack or a support strap to hold the catalytic converter in place as you remove the final bolts.
5. Remove the Converter: Carefully detach the catalytic converter from the exhaust system.

3. Inspect and Replace

1. Inspect the Old Converter: Check for signs of clogging, melting, or rattling.
2. Install New Catalytic Converter:
   • Position the new catalytic converter in place, aligning it with the exhaust flanges.
   • Hand-tighten the bolts before fully tightening to ensure proper alignment.
3. Torque Specifications: Use a torque wrench to tighten bolts to the manufacturer's specifications (typically around 30-50 ft-lbs, but verify with the service manual).
4. Reinstall Any Heat Shields: If applicable, reinstall any heat shields that were removed during the process.

4. Reconnect Battery and Test

1. Reconnect the Battery: Ensure all connections are secure and reconnect the negative battery terminal.
2. Start the Engine: Check for any leaks or unusual noises around the installation area.