Now that the nice weather is here, I was running with windows open (not warm enough in the Northeast for A/C yet), tried sunroof open, windows closed.....all open.There didn't seem to be a "combo" that wasn't letting in the diesel smell. (Oh, and with all windows/sun roof closed, there is zero smell)

Anyone have a "trick" or know of a combo that works better than others?

FWIW, when I had leaky injector return lines last summer, I initially thought it was an exhaust leak. We went up & down the whole system with a mechanics stethoscope listening for a leak.....and didn't find any, so I don't think it's that. Once the cracked injector return lines were replaced, all was well. This condition was real bad with all the windows up/sunroof closed.

I also double checked that the tail pipe exit was NOT (somewhat) impeded by the rear bumper (which might cause gases to perhaps find their way into the trunk area), so I don't believe that's the culprit either.

Anyone have any suggestions? Is there a setting on the ACC that gives the cabin (more) positive pressure and keep the fumes out?

Thanks in advance....