Isn't there 2 bung locations?
Sensor 1, direct exhaust flow. (This is what the ECU uses for adjustments)
Sensor 2, extension bung to defeat CEL.
If your tuner doesn't know this, get a different tuner.
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PW 07 HR350Z R.I.P. Totaled by 82yr old woman 
2010 40th Anniversary 370Z
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