97 civic auto swapped to manual, 1996 mtx ecu. can scan for codes anymore

Friend of a friends car. PO swapped it to stick and left the atx computer, now that the car needs to be inspected we swapped in a mtx computer so it wouldnt have all the “atx not found” type codes

Car runs fine now (as it did before) but I can no longer scan it for codes.

I know theres a few issues w/ engine sensors, but fixing stuff blind isnt an option, especially because it has to be scanned for inspection

any suggestions?

noone?

honda’s are out, bmw’s are in. sorry brah.