2001 Hyundai Elantra Q&A

2001 Hyundai Elantra Question: o2 sensor

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. -
Answer 1
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. -
Answer 2
This is the CAT monitoring sensor that is to the rear of the CAT converter. -
Answer 3
how do u change an o2 sensor before the catalit converter? -
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