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Re: 02 gauge not reading after removal of rear 02
Are you feeding the wide-band into the stock ECU? If not, just plug the rear O2 sensor back in. A stock ECU will not look at a wide-band the same as it would a narrow-band sensor. A narrow-band sensor is more of an on-off signal where the wide-band is in real-time.
What this means is that the ECU is looking to calibrate it's low & mid LTFT fuel tables so the O2 sensor bounces over and under .5v while in closed-loop operation. A wide-band sends a signal of 1-5v based on the actual fuel mixture with no on-off.
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