rajacars 
2012 Nissan Maxima Sedan 3.5 S 4dr Sedan (3.5L 6cyl CVT)
Knock at low speed.
 I Hear a knock at low speed, its one time after you start and move the car.It looks that nissan doesn't car enough to fix this issue. hoping that nissan takes this issue serious, as Maxima is nissan's flagship sedan. if the reputation is spoiled its difficult to gain it back.