I need front O2's for my swap project. Guy at lt1swap.com is flashing my base file for me, and said since I have a blue/green connector PCM, I can use any square-plug '03-up O2. Now, it seems that when searching for O2's, for some vehicles it lists that the same sensor is used upstream & downstream - is this true? I guess it just depends on the plug sometimes, because my harness has different gender plugs for upstream & downstream. Thanks!!

 

Nobody uses a generic O2 and just wires on the plug they already have?