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Rear o2 sensor, which wire is what? *pic inside*

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Old Sep 22, 2010, 07:37 PM
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Rear o2 sensor, which wire is what? *pic inside*



Can someone tell me which wire does what for this rear o2 sensor on my evo x? I don't have access to a service manual so any help would be greatly appreciated!

I just need to know which one is the 12v, ground, and o2 sensor signal wires
Old Sep 22, 2010, 08:09 PM
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Multi-meter.

The 12 v one is the one with 12 volts. The one that ohms out to ground is ground, and the one left is your signal wire.
Old Sep 22, 2010, 08:10 PM
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Originally Posted by Golden
Multi-meter.

The 12 v one is the one with 12 volts. The one that ohms out to ground is ground, and the one left is your signal wire.
Smart-*** response, but very very true..
Old Sep 22, 2010, 11:59 PM
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haha, not a smart *** response at all...its totally true but unfortunately i dont have a multimeter, and dont know how to use one either....I'm just wondering if someone that has access to a service manual or knows what wire does what....
Old Sep 23, 2010, 07:48 AM
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for the stock sensor (denso), it should be:

blue: signal+
white: signal-
black: heater
black: heater
(heater wires are not polarity dependent)
Old Sep 28, 2010, 03:02 AM
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wait, so the white wire is sensor ground?
Old Sep 28, 2010, 06:57 AM
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Originally Posted by steven88
wait, so the white wire is sensor ground?
yes
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