I have an 06 Xterra and when I bought it last year ai had 2 of the catalytic converters changed. When the shop removed and replaced them they cut the wiring harness to one of my 02 sensors. I know that because my check engine light came on for that reason and I had a mechanic look under the truck. He said it's about a 6ft wiring harness that connects to an 02 sensor on the driver's side. I'm trying to order the harness but don't know exactly what to ask for. Any ideas?