Stage 3 turns doesn’t look at the rear o2, so it doesn’t throw any codes for that. And I’m glad you have the code scrubber, its a big headache that all the stage 3 guys have to deal with, so if this comes with it, it saves the buyer $175. You should put that in the included parts, so the buyers know 
This car should run low 12’s / high 11’s as it sits, so someone is getting a good deal!
–mark