Ok, I got my key code and a new key for my 97 this week. My door lock problem has now gone !!!
I went into Courtesy Nissan and they told me the following
1) the key code lookup goes back more than 10 years BUT is spotty for older cars, some 97's, no 2000's, in other words they try this first, you may get lucky.
2) Nissan keeps the key codes, Courtesy called for me, got my key code !!! it seems to depend on who answer's the phone at Nissan, so if this doesn't work because they wont look it up try again. Make sure you find out why they cant get it, ie wont or its not available.
3) the Selling dealer often keeps the code. Courtesy tells me that they keep theirs in the service department.
If you don't know the selling dealer Nissan can find this for you.
Go to your local Nissan dealer parts department or service department and get help.
2003 Pathfinder from 2004 SE 4WD
1997 SER 5sp Manual from new Rear Ended 2009 !!
Gone to the Knacker yard...
New ride 3.0 manual RWD not a Nissan !!! Gone 2016 from Hail damage.
1997 Sentra GXE from new .... Sold 2008
2001 Sunny N16 RHD from new (N16 Nissan Bluebird Sylphy) Sold