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In the power fc menu, there is a setting to turn the stock o2 sensor on or off. Well not really on/off per se but whether or not to reference to it.
When you go to tune the car, the tuner will turn that function off because it will throw the tune off and besides the tuner will be looking at the wideband.
What is weird though is that last time I went to matt at monkeywrench, he told me that the power fc wasn't reading my stock o2 sensor and that its probably fouled. I figured that it was possible because I had that same o2 sensor when I blew the ringlands on my sr. So I went ahead and replaced it shortly after I got my car tuned there.
There is a o2 sensor monitor in the power fc commander but what's weird is that when I go to that monitor, it show 0 volts. So not really sure what is going on with that.
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