Yes
If it came from the factory with a catalytic converter then it must have one
Yes
The four cylinder model has one catalytic converter.
That depends on the make , model, and engine.That depends on the make , model, and engine.
The only fix for a bad converter is to replace it. The price of the converter varies greatly form one model vehicle to another.
$200-$1500, it depends on the year, make, and model.
Depends on the year of the car. If the 3000gt is a 91-93 model then the oxygen sensor should be right before the catalytic converter sticking off of the exhaust pipe. If it is a 94-99 model then there will be one before the catalytic converter and one right after it as well.
Not sure but a 1991 model does, so it stands to reason that a 1990 would.
There are two (minimum) in the exhaust systems on late model cars and light trucks. They are installed before and after the catalytic converter as the gas flows through the system. Thus pre and post "cat" (Catalytic Converter)
It sure did, That is the law on all makes and models.
Depending on the year, make and model you can probably purchase a bolt in or a weld in cat.
Catalytic converters are used to control emissions from your car. Prices will vary depending on the year, model and make of your car. The following website may help ..www.sellyourcatsdirect.com/Converter_Catalog.html