dfwtexas 
2012 Nissan Maxima Sedan 3.5 SV 4dr Sedan (3.5L 6cyl CVT)
Knock Knock
 My 2012 Nissan Maxima also has the knocks at 30 mph...I've had it for 3 months and did not hear it when I first test drove it as well. I have taken it to the dealership and st first they had no clue to what it was...The fleet manager pointed it out that it was the ABS...I totally agree that such a steep price to hear a knock every time is very annoying. I have an appointment with a engineer from Nissan but I have a feeling that is just the way the car is built....We test drove a 2012 with 9 miles and it made the exact same knock at 30.Would love for Nissan to put out a formal report on the issue. I have a feeling it is something that will go wrong sometime down the line.