06 Pathfinder O2 sensor voltage sensor 1

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My Pathfinder will likely never will any awards for fuel economy. However, I thought I would look into it. Plugs are like new, air filter new, oil changed, tires inflated. Hooked scan tool up, and see Bank 1, sensor 1 switches between .2 and .875 volts. Bank 2 sensor 1, switches between .48 volts and 1.25 volts and never goes below .48 volts. No codes or MIL's

Can I assume bank 2 sensor one is lazy, and not giving me optimum fuel economy, or is this too simplistic? I have not had time to look at fuel trims.
 
Is this a four wire heated oxygen sensor? Or a wide-band air-fuel sensor?

A standard oxygen sensor might generate a voltage up to 0.9V, but not over that. I suspect a ground or ECU problem.

Is it easy to swap the two sensors?
 
They are 5 wire Wideband, does that matter? I could swap from side to side, but for the work involved I would just buy a new one. They dont last forever, and on my last truck I saw a significant increase in fuel economy when swapping both fronts.
 
The ECM is producing a Replicated narrow-band O2 voltage reading then.......Because Wide-Band/Air-Fuel Ratio sensors do not switch Rich/Lean. Not surprising for Japanese makes to replicate readable O2 voltages.
Fuel Trims are a better diagnostic tool here!
 
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