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Whats up guys this is my first post. So i just got a 1989 si, and it had a zc swap already done to it, the motor and tranny are very strong. But the person who swapped it cut out alot of wires, for example the o2 is cut and i cant find the wire. So what im wondering is if so any wires are cut, should i repair it or replace the entire wire harness. And if so which wire harness could i swap into it other than the si ones. Thanks guys,

 
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I'm pretty sure the SI ones. The dx/lx D15b2 wire harness are different. Can you trace the wires? Maybe you can find where the o2 plugs into or get a plug and solder it in place

 
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So only the si harness would work? And thats the thing many wires have been cut an i cant find the wires. Also some vacuum lines are not connected to the intake. But the car still runs strong. Also the ecu is throwing a code 13 but thats it, if the o2 sensor is cut shouldnt there be a code for that aswell?

 
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13: BARO Sensor (Atmospheric Pressure)
defective circuit or unplugged / defective sensor
I believe code 1-2 is oxygen sensor. And it should come up unless bypassed somehow. Try following all the wires around and take some pictures maybe we can help you out.