Which O2 sensor is bank 2 sensor 1 ?

For my 2003 astro van , my scanner tells me that I have a heater failure in the #1 O2 sensor on Bank2
How does this work? The car van three sensors, one on each side after
the manifold and one just before the cat converter.
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R/h bank, 1st sensor.

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Passenger side, after the manifold.
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