I had the same problem. I changed the door ajar sensor and still light came on. I went to the Nissan dealer and they showed me that I the door frame where the door sensor touches was dented because I had closed the door several times over the years with the seat belt metal insert hanging outside smashed and dented the door frame. I bought JB Weld and put it on the door frame and evened it out. Solved the problem! Hope this helps.The door ajar warning on the driver's side stays on and wouldn't go away. Any solutions?