A/F sensor (b1 s1) acting up?

My A/F sensor is fluctuating back & forth every 10 seconds or so, from 3.295v to 3.3v key in on position.
Truck has not been running today.
Should it be doing this?
Nothing else is active.
Might be worth noting though, that ltft is reading 1.6.
Timing advance 5

Other than that just temps (although intake is higher than coolant) & throttle position. These I would expect. All others at 0

 

Not an expert but seems pretty negligible. It probably isn’t even heated up. No real data to be found if the truck isn’t on imo

edit:fyi that sensor belongs in that voltage range.

 

Right. I was more questioning if it should even be active (the fluctuation) when the truck isn't on.
I'll see if there's an option to change the data output on the scanner.