Replaced B2S2 due to the vehicle setting a P0161 Any issues for this I don't know of yet?

Question

I did a diagnostic service w\induction service to it for poor EGR emissions and driveability @ idle. Corrected EGR issues and poor running but the vehicle is still setting HO² sensor code after customer took that part of the diag upon themselves to fix. Trying to keep my regulars happy but not cut my own throat at the same time, I did what I could free to help but other than running a full diag on it, IDK and the vehicle isn't in my hands yet so they're gonna pay for this repair to be done properly. (As it should have from the start!)
Vehicle doesn't have a dedicated HO² fuse so other than a junk O² out of the box (which I'll check first when it arrives Fri for my Diagnostic service.) Any help would be appreciated.