how to fix my Toyota Highlander Third Generation (2014-2019) with a bad catalytic converter?

Solution

1. Preparation

• Gather tools and parts needed for the repair.
• Ensure the vehicle is parked on a flat surface and the engine is cool.
• Disconnect the battery to prevent electrical issues during the repair.

2. Raise the Vehicle

• Using a jack, lift the vehicle and secure it with jack stands.
• Ensure safety by checking that the vehicle is stable before working underneath.

3. Remove the Exhaust Components

• Tools Required: Socket set, wrench, penetrating oil.
• Spray penetrating oil on the exhaust bolts to ease removal.
• Use the socket set to remove the bolts securing the catalytic converter to the exhaust manifold and the exhaust pipe.
• Carefully lower the catalytic converter from its mounting position.

4. Inspect and Clean

• Inspect the removed catalytic converter for signs of damage or clogging.
• If the converter is not severely damaged, clean it with a suitable catalytic converter cleaner; otherwise, proceed to replacement.

5. Install the New Catalytic Converter

• Parts Required: New catalytic converter, exhaust gaskets, and possibly new bolts.
• Position the new catalytic converter in place, ensuring proper alignment with the exhaust manifold and exhaust pipe.
• Install new gaskets (if required) and secure the catalytic converter with the bolts, tightening them to the manufacturer's torque specifications (typically around 30-50 lb-ft, but check your specific model).

6. Reconnect Components

• Reconnect any exhaust hangers or brackets that were removed.
• Reconnect the vehicle's battery.