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I have no smog equipment, so i wanted to ask what was all included as smog equipment on the d15b vtec, and no cat, aftermarket exhaust mani.intake pipe, and the evap has been removed

i just bought this 95 civic dx with a d15b vtec motor, its running ona p72 ecu and throwing a code 23 for the knock sensor which it does not have, my question is, is it retarded the timing because it has no knock sensor? also im have a code 1, and 22 as well. so im geussing the gsr ecu si...