||A narrow band to tell if it's rich or lean, an oxygen sensor for lean (excess oxygen) and a fuel sensor for rich. (excess fuel)
It could be used to account for the mixture changes caused by E85, but that's not the best way to go about it. Better/more efficient to tell the ECU what it's getting instead of making it react and compensate.
"Capitalization is the difference between helping your Uncle Jack off a horse, and helping your uncle jack off a horse."
"'she' also likes to swap since I think I am going to need to give her to woody again." - Dvlhntr
"full alphabetic boost mode" -
" Purrs like a sexually satisfied black panther." - BigTDogg
"Two oil eating, angry, spinning triangles of death." - turtleboy on rotary engines