I too bought my 2011 Nissan Altima brand new. My vehicle has only 15,000 miles.
I have been experiencing engine noise and rattling noise on the right front tire. I have taken my vehicle to the dealer to check for the problem. The service rep came back to me after several hours to inform me that my vehicle was ready. He failed to tell me that they not able to duplicate the problem.
I noticed going home and the rattling noise was still present. When I got home, I took a close look at my receipt. The technician documented they were unable to duplicate the problem.
It would have been nice if they had told me this.
I would have pointed out exactly when and how the noise occurs.
I am pissed off because I paid a lot of money for my vehicle. I purchased the top of the line in the Altima series fully loaded!