When the car is in motion, there isn't an issue, but when I'm coming to a stop, idling, or reversing, there's a distinct smell of exhaust that makes it's way into the car, even when the vents are on a low setting.

I've taken it to two dealerships to get it checked out, and they claim the mechanics couldn't replicate the issue. Well no duh, they're nose-blind; they're around fumes all day, so obviously they won't smell it. They couldn't find any exhaust leaks and no errors showed on the diagnostic either.

It's bad enough that when I'm in traffic with the vents on, I'll get a headache. I don't want to get CO2 poisoning, so now I'm forced to turn off the vents whenever I'm not in motion. This is a huge problem because I live in Toronto. There's a lot of traffic in Toronto; there are a lot of pedestrians in Toronto, so in the winter, while not in motion, the windows start to fog up, and that makes it dangerous to drive, plus it gets cold pretty quickly.