That would depend on year/model of the the donor vehicle. I think some model trucks have female connectors like f-bodies (not 100%). I say this b/c a buddy of mine gave me his old rear o2 sensors of his HD. His would not work on my truck b/c it was a male connector o2. All four of my o2 connectors (harness-side) are male. Physically, male to male won&#39;t work. (<--- and shouldn&#39;t work regarding human life, but that&#39;s another thread-starter)

Anyhow... your o2 connectors should be square-shaped with four pins. Colors will vary, but I think it&#39;s something like 2 tans, 1 purple, and 1 brown. I&#39;ll have to check later today.