One problem related to front suspension wheel bearing has been reported for the 2009 Nissan Altima. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2009 Nissan Altima based on all problems reported for the 2009 Altima.
After about 37000 miles I started to hear a "whirring" or kind of "roaring" noise while driving. I noticed the noise sped up and got a bit louder as I accelerated. I asked a mechanic to check the brakes and those were fine. At the next oil change, I asked the mechanic to ride in the car because the noise had gotten louder. They found one of the front wheel bearings to be worn out. I took the car to a dealer, because the wheel bearings are covered under the power-train warranty until 60000 miles. The dealer found both front wheel bearings "completely worn out" (per their notes on the work order). Wheel bearings should not be wearing out this early.