Forgive me if I'm wrong about anything, I'll try to be as detailed as possible.

My check engine light is on, and after doing the diagnostics check it showed itis my oxygen sensor. I had a friend of mine take a look at my car, and was going to have him replace the O2 sensor for me. It's the Oxygen sensor at the front of the engine, and the wires run down underneath the car to somewhere towards the back (I want to say near the manifold?). Come to find out, the wires have been chewed off right before the area where they enter thewiring harness. Please forgive me, I am just trying to remember what the mechanic told me. Anyways, he said something about me needing to put in a new wiring harness. I have no idea where to find one, and no idea what the part is called that I need. Anyone have any ideas???