I bought a Nissan Pathfinder back in August of 2013 and have about 9,400 miles on the vehicle so far. Yesterday and this morning I noticed a knock or a popping sound coming from the floorboards basically right under my foot if it's resting below my drivers seat. It happens some sporadically on the highway but I can really feel it when I'm going like 20-25 and hit the brakes and sometimes around 35 or so when I speed up. I'm planning on taking it into the dealership since everything is still under warranty but I'm curious if anyone knows what might be causing this.
