how to diagnose a faulty catalytic converter in my Ford Mustang S550 (2015-2023)

Solution

1. Preparation

• Gather tools and parts necessary for the repair.
• Disconnect the battery to ensure safety while working on the exhaust system.
• Tools Required: OBD-II scanner, vacuum gauge, exhaust back pressure gauge, temperature probe, socket set, wrenches.

2. Replace Catalytic Converter

• Remove Heat Shield (if applicable)

  • Use a socket set to remove any bolts securing the heat shield.
  • Set aside the heat shield for reinstallation.

• Disconnect Exhaust Components

  • Locate the bolts connecting the catalytic converter to the exhaust manifold and the mid-pipe.
  • Use a wrench or socket to remove these bolts. If they are rusted, apply penetrating oil and allow it to sit before attempting removal.

• Remove Old Catalytic Converter

  • Carefully slide the catalytic converter out of the exhaust system. If it is stuck, gently tap it with a rubber mallet.

• Install New Catalytic Converter

  • Position the new catalytic converter in place and ensure proper alignment with the exhaust manifold and mid-pipe.
  • Use the original bolts or new ones to secure the catalytic converter, tightening them to the manufacturer's specified torque (typically around 30-35 lb-ft, but check specifications).

• Reinstall Heat Shield

  • Reattach the heat shield using the original bolts or new ones as needed.

3. Reconnect Battery

• Reconnect the battery terminals securely.

4. Clear Error Codes

• Use the OBD-II scanner to reset any error codes stored in the vehicle's computer.