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Q: o2 sensor on 2001 Hyundai Elantra

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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.
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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.
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