Hi guys, and gals!
I have a 2013 Roush Mustang stage3 phase 3. I bought it brand new, today is 9-5-2020, and I have 2500(not a misprint) miles on it. I changed the battery this spring, and now it wont pass emissions! I have done a lot of research on YouTube. I drove it this A.M. for about 2 hours trying to complete a drive cycle. Only one of the tests passed! I downloaded the Ford "drive cycle" mandate and performed all the criteria on it. Only quest I have is W.T.F. ?!!!!!!!!

9-5-2020 Roush Mustang Drive Cycle results

 

hmmmm . . . the exact requirements to complete the mysterious "drive cycle" are always a bit fuzzy, I think I'd try a few more short trips with the car shut off in between, and then check it again

make sure the car and exhaust are good and warm when you check to see if the sensors are ready

those sensors might be turned off in the tune; but I don't understand why they seemed to be working before you changed the battery . . . . you did NOT re-load a different tune, correct? Removing the battery will reset the history that is stored in the computer, but it should not change the tune.

 

Cold starts are more important than miles driven.
Some generic info I found while trying to reset my monitors..
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Poor thing wants to be driven more is all. It's just got the vapors from slumbering!

/This right here is why you should drive these things, not make them museum pieces, but that's me and my awful opinion because I wanna drive ALL THE THINGS but can't...
//Pics of yer car when ya can, sounds like it's pristine! And welcome aboard!

 

I actually had this same issue on my Whippled '13 GT, I tried the OBD cycle countless times.
Started speaking with my tuner, he sent me a few different tune revisions, none of them worked.
Ended up going for a datalog-drive with him on a Saturday, and he made some changes almost instantly.
Drove home and as I was pulling into my driveway the sensors all went OBD-ready (about a 45-minute drive).
So, I'd say it's your tune.
Might want to contact a local tuner to see if they'll do a datalog drive with you.