Come on man, think about it, you've really got to take this vehicle to the dealer service department for FREE warranty diagnosis!! For maintenance items a generic shop should be fine, but if you need to diagnose a problem, the ONLY place you should be taking your vehcle is to Nissan.

If you've got a check engine light, THERE WILL BE NO CHARGE BECAUSE YOU HAVE A WARRANTY, that's one of the main reasons people buy a new vehicle vs. used. Why would you pay the small garage money to diagnose the problem when Nissan will do it for free and they're much more familiar with your specific vehicle, and have the proper tools and knowledge to service Nissan vehicles? Even if they determine it's not a problem, perhaps just a loose gas cap, they still will diagnose the problem under warranty because all check-engine codes are obviously not normal and the warranty covers this.

Now go get to the dealership and smartin up man!!!!