my 97 civic check engine light

[Estorvito]

@cky89

year: 1997
make: honda
model: civic DX 4 door
mileage: almost 237xxx
mods: none
transmission: autotragic

ok so my check engine light was on for a while. then i installed some subs and had to disconnect the battery terminal. it then of course went off. so today i went to autozone to have them check it and they hooked up their tool and nothing happened to either of the 2 they tried. what could be the problem that the computer wouldnt even power up to tell me why the light was on? is it a wiring problem?

if someone knows the problem could they please inform me of what it is and how to solve it and how difficult it is.

also i was told from the original owner that it was some sort of fuel sensor. would this be why im having terrible fuel mileage right now?

thanks in advance

Notghing is going to show in the scanner unless there is a light on,…
Wairt till it comes back on and recheck it…