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Joey,
Did you find a solution? I just installed my AF Gauge today and I am having the exact same symptoms. I get about 200mV constant, which changes a little bit, but not much. I have an S13 black top in my S13 convertible.
My understanding is that the three wires that come out of the o2 sensor are:
black: heater wire
black: heater wire
white: output wire
Theoretically the o2 sensor should work without the heaters plugged in, but the sensor must reach 600 degrees first. So I wired the output directly to the AF gauge and drove the car hard for a while. Acted exactly the same as having everything plugged in. Then I wired the heater wires to the battery and tried again, no change.
Darren
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