How do I get the door ajar light to go off

My Mazda Tribute just had the same problem, it has internal sensors in the door latch. One door handle felt a bit loose, it would open the door and the lock would hold when the door closed but the handle still felt loose, so I checked this one first. On removing the inner door panel I could see a part not fully returning, so sprayed some WD40 on this and wriggled it till it it returned fully every time, taking the looseness out of the handle and fixing the light problem.

My 2014 Rogue had front driver door open, door locks were locking and unlocking. Took vehicle to Nissan dealership, they looked at driver door and noticed dents on door frame where the door contacts the activator switch, dents were caused by closing door on seatbelt, we filled dented area in with tape and it corrected the problem immediately…. maybe this could be your problem also…….. Hope it helps …. Jim