Charleyboii

Sup guys! need some help i’ve taking all the connectors out the modules and o2 sensors an activators an all the but its this one wire thats goes back on the wires that goes down in the back but this wire dips out somwhere behind the engine i believe or somewhee infront of the trans i got it circled in the picture just need some info on where its going and do i have to drop the trans or not? and picture is frm google