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Does anyone know what wire on pre-cat o2 sensor is the signal wire? Im hooking up a air/fuel meter so that i can fine tune my V-AFC to get more power then I can share the program w/ everyone.

 
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i have mine hooked up to right where the header meets the rest of the enine and i beleive it is a black wire

 
Rep Power: 331

hmm, i thought black was the ground for the heater element?

 
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don't you need to tap the signal wire on o2 sensor on the intake b/c its before the engine. the fuel needs to be adjusted according to air going into the engine not the air coming out (from the header).

 
Rep Power: 331

This isnt for my V-AFC this is for my air/fuel gauge...you dont even use the sensor on the intake for the v-afc anyways, I just need know wich wire on the o2 sensor wire is the signal wire.

 
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Just hooked mine up the other day....it's the white one.

 
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Learn what you are talking about before misinforming people, I could just see someone hooking up a a/f gauge on their intake and screwing things up bad! You have no clue what you are talking about, o2 sensors are on the EXHAUST. The sensor on the intake you are refeering to is the IAT and reads temperature! For being a super member you must post a lot of crap! ALso the fuel is adjusted by the emissions, depending on how much emissions are in the exhaust it adjust the fuel map, that's why the o2 sensors are in the exhaust. The intake is for air coming into the car!

 
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It's the white one, he is correct....

 
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yeah the 1st o2 sensor its the white one, the 2nd o2 sensor its the black one.. I was talking to Desi as being wrong at saying the o2 sensor is on the intake, WTF....