They don't seem to have solved the problem that replacing the O2 sensor was supposed to be for - an erratic idle and occasional stalling out when in neutral - but I'm happy just to have my car out of there. Going straight to the top works sometimes, I guess - I got the general manager of the dealership on the phone yesterday, and he straightened things out.
I spent an hour making phone calls this morning, and got almost exclusively answering machines; I scheduled one kid to come in for my study. Ah, well. Back to it.