how can I tell if my Toyota Highlander Fourth Generation (2020-present) catalytic converter is bad

Solution

1. Preparation

• Tools Required: OBD-II scanner, temperature gun, socket set, jack and jack stands, backpressure gauge.
• Ensure the vehicle is parked on a flat surface and the engine is cool.
• Disconnect the negative battery terminal to avoid electrical issues.

2. Remove the Catalytic Converter

• Sub-steps:
  1. Raise the vehicle using a jack and secure it with jack stands.
  2. Locate the catalytic converter in the exhaust system.
  3. Using a socket set, unbolt the catalytic converter from the exhaust manifold and the exhaust pipe.
  4. Carefully remove the catalytic converter from the vehicle.

3. Inspect and Replace

• Sub-steps:
  1. Inspect the removed catalytic converter for clogs, damage, or excessive soot.
  2. If faulty, replace it with a new catalytic converter that meets OEM specifications.
  3. Use a gasket or sealant as required to ensure a proper seal when reinstalling.

4. Reinstall the Catalytic Converter

• Sub-steps:
  1. Position the new or repaired catalytic converter in place.
  2. Bolt the catalytic converter back to the exhaust manifold and exhaust pipe, making sure to torque the bolts to manufacturer specifications.
  3. Reconnect the negative battery terminal.

5. Final Checks

• Sub-steps:
  1. Start the vehicle and listen for any unusual noises.
  2. Check for exhaust leaks around the installed catalytic converter.
  3. Clear any stored trouble codes from the OBD-II system and perform a test drive.