Ok, I have replaced my 02 sensor with the NTK one from NOPI, now i am ready to wire it.. white, white, black, grey... what are these... is grey the signal wire and black is ground and white's are what? for the heater? does it matter how i wire the whites or how can i tell them apart?

just look at the old one, and wire the new one up in the same pattern, one wire at a time. Once you get under there you'll figure it out. no stressi

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My $.02
95 GS

Unless there's some crazyiness with the DFI, that uses a different wiring setup. If so, than my last two posts are a waste of server space.

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My $.02
95 GS

well, you kept me bumped to the top atleast Yeah, I was looking at the shit but i duuno what the whites are... that my only prob, dont wanna get them backwards.... then I gotta wire my a/f wires in also.. what i am doing is i had an 02 sensor in the downpipe for the dfi, but i am not gonna need it for the dfi cause its worthless just about... so I am gonna use that one for my front OEM 02 sensor and have the factory holes plugged or new piping made...

The NTK wires don't match up with the OEM one, but the colors do. The two whites are INTERCHANGEABLE. I did some research, and polarity doesn't matter on it, so you can interchange them. The gray is the signal, and the two whites are for the heater in the o2 sensor. I suggest getting heat shrink tubing and after you splice the wires together, use the tubing to create a good seal around it...

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2004 WRX - WR Blue Pearl
1997 Eclipse GS - Royal Sapphire Pearl

good deal, thanks a lot! I figured that, but i wasnt sure... back to the garage i go btw, i started the engine for the first time since july. i pulled the plug wires and let it turn over for awhile till the oil and fuel pressures built up, then pleged em back in and she fired right up.. another days worth of work and she'll be back on the street ready to suck up some cool winter air