One problem related to engine noise has been reported for the 2012 Nissan Altima. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2012 Nissan Altima based on all problems reported for the 2012 Altima.
Pooo18 crankshaft/camshaft sensor engine dies loss of brakes and steering thank god coming up to house slowing to park, city street. Restart engine sounds like running on 3 cylinders. Turned off start again, pull code and erase. It runs like nothing ever happened. Called Nissan and they told me that since I erased the code they can do nothing. Google 2012 Altima engine stall and prepare to spend the rest of your afternoon reading stories.