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O2 sensor doesn't work untill they got heat up to a few hundred degree. Drive around till engine get off cold idle and see. If it take more than 5 min of driving to get it to work, get new sensor. Also if it work and stop working when you idle the car for a while, get new sensor again.
BTW do not use the gauge to tune the engine unless you have a wideband O2 sensor.
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