how to tell if my Ford Mustang S550 (2015-2023) has a bad catalytic converter

Solution

1. Preparation

• Gather tools and parts needed for repair.
• Ensure the vehicle is parked on a flat surface and the parking brake is engaged.
• Disconnect the battery to ensure safety during repairs.

2. Remove the Catalytic Converter

• Raise the vehicle using a jack and secure it with jack stands.
• Locate the catalytic converter in the exhaust system.
• Using a socket set, remove the bolts connecting the catalytic converter to the exhaust manifold and the exhaust pipe.
• Carefully remove the catalytic converter from its mounting points. If needed, use penetrating oil to loosen rusted bolts.

3. Inspect and Replace

• Inspect the old catalytic converter for damage or clogging.
• If replacing, install the new catalytic converter by reversing the removal process:
  • Position the new catalytic converter in place.
  • Secure it with the bolts; tighten to manufacturer specifications (usually around 25-30 lb-ft).

4. Reconnect and Test

• Reconnect the battery.
• Start the engine and let it idle for a few minutes to ensure proper operation.
• Check for exhaust leaks around the connections.