Fox '86 3.8l 02 Sensor Hunt..passenger Side?

Okay. Ive located the one of the drivers side. Single wire, crimp on style. Passenger side has one on the exhaust manifold aswell, with what appears to be an in-line resistor. All the parts houses tell me that it should only have one (the drivers side one.) What am I missing? Ive followed the single wire off the 02 Sensor on the passenger side and it goes to a rather large connector that has 4 wires going in. Two Grounds, and Two Leads...both from the 02 sensors on each bank.

Can anyone shed light on this? Thank You.
 
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