What are all of the possible causes? My car smells like exhaust fumes after 30 or so minutes of driving. I know this is dangerous and I need to get fixed asap. Plus my girlfriend doesn't like the smell 2 much either. I did a lil bit of research. So far I know it could be from an exhaust leak or the seals around my hatch going since the exhaust comes out from the back and when driving a hatchback at speed, the rushing air creates a vacuum that keeps the exhaust gases around the hatch and if my seals are going then it can let those exhaust fumes in through the rear. I read that online somewhere, is that true? Driving with the windows down doesn't help with the smell too much but at least i know fresh air is coming in. Any idea's?