OK, time for some level setting. Mostly my experience, take it for what it's worth...
-Ford's claim is that the carbon monoxide in every Police Interceptor Utility they've tested was due to bad upfitting. I definitely believe that's part of it.
-Ford's claim is is that the exhaust smell in the civilian vehicles is *not* carbon monoxide, and that further, that anything entering the cabin was within normal limits. There was only one exception that I know of:
https://jalopnik.com/ford-offers-to-buy-back-couples-explorer-after-its-engi-1819139490 I believe this too, because...
-I've been running a passive CO detector in my car.
It's never triggered.
-I've had the exhaust smell in my vehicle. My dealer spent MULTIPLE service visits fixing the smell issue before finally conquering it.
That problem has been greatly reduced if not eliminated from when the car was producing a smell when lugging up a grade or on hard acceleration post repair. That problem may have been in addition to any CO entering the cabin or separate from it. I can't detect the latter. I did detect a smell, as a nuisance as opposed to a hazardous CO event.
-I really only smell "the smell" now
when the vehicle in front of me is gunning it, sending its own CO into the atmosphere and, me being behind, sucking it into the cabin.
In summary:
-Are people getting CO in their cars as civilian builds? Not more or less than any other vehicle or from any other vehicle, most likely.
-Is there a smell issue with this car? Yes, it's well documented, but Ford's corrective actions are working. I've never had a car smell so rough as this one pre-fix. Maybe all cars are doing it per the cat overtemp theory, but for some reason the aero or otherwise on this one makes it more acute.
That all said, Ford didn't help itself by calling the 17N03 program "CARBON MONOXIDE CONCERNS" in OASIS. I still don't know how the lawyers permitted that one to go out.