You'll know it's missing if your car makes a loud roar when you start it and gets louder as you accelerate. You might also notice an increase in exhaust fumes. Finally, you can check for missing parts under the car, around the muffler.
Scenarios | Answer to select |
Missing catalytic converter | No, it's missing. |
Inoperable catalytic converter | Yes, it's attached. |
Aftermarket catalytic converter | Yes, it's attached. |
Inoperable aftermarket catalytic converter | Yes, it's attached. |