"check engine soon"

Service Engine Soon is controlled by your own setting. After each service, you reset the mileage. To get rid of, or reset it, you just reset. There should be a reset in your info menu, it does differ by model year of your Nissan. If not, you'll need a scanner plugged in. If you had the car serviced by a mechanic and he failed to do the reset, just go back and have him do the reset. Its part of the job you paid for.