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Q: 2000 NIssan Frontier SE v6 3.3

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Code reader shows ..... Oxygen sensor B2 S1

Is that upstream or downstream Brother showed me its on passenger side.
My car has an automatic transmission.

Hello, thank you for writing in. The bank 2 sensors are going to be on the left side of the vehicle (the driver’s side). Sensor 1 is going to be upstream from the catalytic converter. Depending on your engine code, you may need to replace the sensor. For more diagnostic help, or to schedule an appointment to have it replaced, contact our service department.

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