They are most likely only clearing the trouble code and not turning off the rear o2 sensors. Instead of having them perform that option via Uprev, you can get an o2 defouler which basically moves the o2 sensor further from the exhaust stream to get rid of the CEL:
Vibrant Tunable Oxygen Sensor Defouler Kit - Universal Exhaust Items
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-320whp / 259wftlbs-
SP Rays -- RE-11s -- SpecialtyZ Tune -- Swift Springs -- Stillen 25R Oil Cooler -- Stillen G3 Intakes -- Berk HFCs -- F.I. 12" CBE -- Stillen Sway Bars -- Es14 Spring -- INGS+1 lip -- CF Spoiler -- GTR Start Button -- VLED Parking Lights -- PWJDM V2 shift knob
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