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o2 sensor on 2001 Hyundai Elantra

I have a code that reads bank 1 sensor 2 which o2 sensor is this the one on exhaust manifod or after the convertor? their like 85 dollars i don't want to buy both of them thanks.

Asked by for the 2001 Hyundai Elantra
It is the Oxygen Sensor that is screwed into the exhaust pipe just past the catalytic converter. Sensor 2 means the downstream O2 sensor, post converter.
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It is the Oxygen Sensor that is screwed into the exhaust pipe just past the catalytic converter. Sensor 2 means the downstream O2 sensor, post converter.
how do u change an o2 sensor before the catalit converter?
This is the CAT monitoring sensor that is to the rear of the CAT converter.