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Old 07-16-2004, 08:55 AM   #1
99gt1
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wire diagram o2 sensor

was tryin to find a wire diagram for the o2 sensor for my 99 grand am gt... i am installing a a/f guage an was wondering wich wire it is i hook it up to
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Old 07-16-2004, 09:20 AM   #2
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Cavity A= Oxygen sensor Low (usually TAN wire)
Cavity B= Oxygen sensor High (usually Purple wire)
Cavity C= Ground for heater element
Cavity D= Ignition power for heater

In newer vehicles the ground wire gets replaced by a control signal from Powertrain Control Module so the heater can be controllered instead of just turned on with ignition.
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Old 07-16-2004, 09:55 AM   #3
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Purple wire is the signal wire.
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Old 07-16-2004, 10:43 AM   #4
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^ yup
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Old 07-17-2004, 11:36 AM   #5
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ok i attached it to that... an my a/f guage is bouncin all over the place... only stays steady when i have the pedal floored... bad a/f guage?
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Old 07-17-2004, 07:52 PM   #6
99gt1
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anyone have any idea why its doin that?
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Old 07-17-2004, 08:43 PM   #7
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That is completely normal. It's more of a multi-colored LED light show than anything else.
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Old 07-18-2004, 07:16 AM   #8
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how is that normal when its bouncin all over the place?
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Old 07-18-2004, 11:59 AM   #9
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Because the O2 sensor readings are all over the place. The gauge is just relaying that mess of data.
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