Took the F-350 to be emissions tested. It failed because of a bad fuel cap, which was leaking. I replaced it, and also discovered that the coolant degas tank was leaking. That probably explains why it was dry when I got the truck. Hopefully that’s the only reason it was losing coolant.
The truck passed when I took it back with a new fuel cap. So that’s good for two years. Now I can get it titled and registered.
What I found interesting was: the tester appeared to do some sort of under-hood visual inspection, though I don’t know what he was checking for (should have asked). He did not put a probe in the tail pipe; he merely checked to make sure it wasn’t emitting any visible smoke. And no dyno test or high-idle test was required.