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I'm assuming you deleted the rear O2s and that code was tripped before the tune was updated to delete the correct codes. The codes are flagged as permanent codes.
In 2010+ cars permanent codes refer to emissions codes that can not be cleared by any scanner nor by disconnecting the battery as they live in non volatile memory and not stored in KAM. They are designed that way to stop people from clearing out codes and going for an emissions inspection.
These codes can only be cleared by fixing the issue and going through up to 3 drive cycles before they will clear.
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Red Hot 2016 Camaro 1SS 6M w/ NPP Exhaust, Speed Engineering 1 7/8" long tube headers and catless xpipe, lethal garage flex fuel kit, self tuned
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