I’d guess you are right DB. For example if someone googles “corolla high hc emissions”, they see a link to this website near the top of the list.
The radio show continues to be broadcast on the San Francisco NPR station, but
I think the SF NPR station KQED announced that will end this month. I agree, even though the episodes have been re-runs for several years now, I rarely recall hearing any of the segments before. I’m not overly concerned about the over the air broadcasts ending as long as the podcastings continue. That’s how I usually listen anyway, as Saturday mornings I’m doing errands & not able to listen to the show usually. The SF station used to run it on Sundays too, which is when I usually listened on the radio. But they ended the Sunday broadcast last year.