One problem related to check engine light on has been reported for the 2011 Nissan Altima. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2011 Nissan Altima based on all problems reported for the 2011 Altima.
The check engine light lit on the dashboard. The associated engine code was p2a00 and both the upstream (air/fuel ratio) and downstream (oxygen) air sensors had to be replaced. The repair cost close to $1,000 please note: this is after many other costly repairs, including most recently another filing with the NHTSA regarding issues with the power steering system where the rack & pinion had to be replaced. While the car has a lot of miles, they're mainly highway miles and the car has been extremely well maintained. Additionally please note: the catalytic converter was replaced ~33k miles ago. During this replacement, supposedly, the aforementioned sensors should've been checked and possibly replaced.