The car had unichip installed and some wires were cut to install it. The unichip is not on the car, and the wires were soldered, however I have a problem with the primary O2 sensor.
After diagnostics/haynes manual, it seems I have to "repair open in wire" between ECU and O2 sensor.

Instead of taking the wire harness out, could I just take out the O2 sensor wires from the ecu and sockets and replace each of them with another wire?
Anyone know the length of the wires I need to use?
Also, any tips? Maybe from someone who installed a wideband o2?