The system probably hasn't completed its drive cycle. The year, make and model info would help us.
Nothing. I need it for my car. Would not pass safety inspection without it.
catalytic converter
If one is referring to a situation in which a vehicle does not pass a smog inspection, there might be several causes. One might be the catalytic converter or an old gas cap.
Catalytic converter plugged?
A catalytic converter can be ruined by a engine that is missing and dumping raw fuel into the converter.
That would be the O2 sensor after the catalytic converter. This sensor monitors the efficiency of the catalytic converter.
Where could I find diagram for 2003 catalytic converter on a Mazada 6
The catalytic converter(s) would be found in the exhaust system between the engine and the muffler.
Upstream would be before the catalytic converter. Downstream would be after the catalytic converter.
Having no catalytic converter installed is illegal and can cause a myriad of problems. Probably not a backfire though.
That would depend on the type of vehicle. If it is a low emissions vehicle you have to go with the oem catalytic converter.
Yes, but why would you want to?