Getting a Replacement Nissan Car Key Your duplicate nissan car key Intelligent Key can do more than unlock your doors and trunk. Make use of it to roll down your windows on a hot summer Fitchburg day or to start your car at the touch of a button. Replace the internal battery of your key fob whenever it begins to run out. Read on to learn how to do this quickly and easily. Replacement Keys It's not as difficult as you think to get a new Nissan key. Older cars used traditional car keys made of steel or brass, however newer models use key fobs that send out an electronic signal that allows you to open and start the vehicle. These are known as smart keys. Depending on the year and model of your Lost Car Key Replacement depending on the model and year, you'll need to contact a dealership, or find a locksmith who is experienced. You'll require proof of ownership for the former. This typically involves the registration number or title.