RE: wheres that interior exhaust smell coming from
Had the same thing BUT wasn't tail lights. Sheetmetal just above the tail lights had rusted thru. Was an area about the size of a finger just above the tail lights and boy did it ever let the bad air in. You have to remove the that black plastic bezel on the tail. I don't believe I ever saw it coming from the inside of the car and removing the interior panels. Apparently water would lay on top of the left tail light and eventually rusted thru, then rusted thru even more.