Emissions

Hi ARCHC123,

Is sounds like the catalytic converter has gone bad. this unit is used to clean the vehicles exhaust system. Here is a guide on how to replace it, though the car is a little different it give you an idea on what you are in for

https://www.2carpros.com/articles/catalytic-converter-replacement

Also if the jack the car up and get under it with a mallet you can hit the exhaust pipe near the cat to see if it rattles, this is a sure sign the cat is bad.

Here is how to jack your car up safely

https://www.2carpros.com/articles/jack-up-and-lift-your-car-safely

Let me know what you find