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Old 01-03-2015, 09:55 AM   #1 (permalink)
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Default 04 forenza O2sensor wires. Oh help!!!!!

I have a 04 forenza S, with 98k, 2.0 D-tec, auto. I fixed the poorly constructed factory air intake, and have put new plugs, and other regular maintnance. I had it scanned and upper O2 sensor was bad, so I got a new one. It is a bosch universal, yea I messed up, but Im stuck with it and I am using it! The problem is I cant find the correct wire code for my year.(signal,ground,etc....). THe instructions suck! My car has 4 wires, 1. green/red stripe 2.brown/tan stripe 3.dark brown 4.redish pink/black stripe. Of course the O2 sensor has 2 wites a gray and a black. 2 are heaters 1 is a signal and 1 is a ground. Which wire goes where? please help!!!!!
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Old 01-09-2015, 03:14 PM   #2 (permalink)
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This is what I found in the manual diagram:

1. green/red stripe = Signal for sensor ("Hi" terminal 26 on ECM)
2. brown/white stripe = Ground for heater ("GND" terminal 49 on ECM)
3. gray = sensor ground ("Low" terminal 34 on ECM)
4. pink/black stripe = +12V for heater coming from a fuse fed by the Main Relay

Good luck. Hope that helps.
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