Lemon?

Originally Posted by FL 4Motion

Call Nissan north america (nna corporate), get them to open a claim, (get the ref # and name of person you spoke to), this way, if you're warrantee expires while it's still getting resolved, you won't be on the hook for it.

Also, like others said, keep all your documentation and start looking into the possibility of lemon lawing the car if you can't get it fixed.