evo 8 log. Front o2 shit out?

[dsmolition]

Hey I’m sure my front o2 is crapping out. I don’t have a cell yet but I’m running a 10-10.9 afr going down the road and my plugs are black. Check out the log. As you can see on the front 02 voltages they just drop to 00 and also it gets stuck at .39 every once and a while. It bogs around and i get a cel for knock almost any time i get into boost. I know the loaded v7 tune is good as I was running it for all last summer with no problems.

Does e85 help screw up 02 sensors? That could be part of the problem as it is a dual map tune.

I just want to be sure before i order a new one from oxeygensensors.com.