Hello, I need to know where oxygen sensor bank2 sensor2 is on 2001 ford windstar 3.8L engine?

I know that bank2 sensor2 is on one of the catalyst converter there is 4 sensors total and the catalyst converters r not side by side one of them is coming from the front of motor/van and the other is coming from back of motor and i don't know which is bank2. Thanx.

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