IYHO - Is Herbie the Love Bug a Sci-Fi/Fantasy Movie?

I would call it fantasy, but not science fiction. There isn't any mention of science being involved in Herbie being sentient. I'd say it's more implied that it "magically or miraculously happened." Therefore, I'd classify it as fantasy.
I agree, and for comparisons sake I'd say KITT from Knight Rider would be considered science fiction.