I bought a used 2003 Xterra 4x4 and it only came with a single key and no key fobs. I finally found a locksmith who made me spares for $5 each, after first insisting it had transponders and would be the $120 key model. Anyway, ordered the same key fobs off eBay as above, but so far no luck in programming them. Before I ordered them I tested with the key insertion and did get the double hazard light flash. Now I can't get it to flash twice after key insertions. Even so, I turned to ACC after inserting 6+ times in 10 seconds and when I press the key fob button I get 2 hazard light flashes. So it would seem to recognize the remote, but when I test I get no response from the vehicle at all. Seems very odd....why does it flash when I depress the buttons during the programming procedure, but then it doesn't work? Could be because I didn't get the initial 2 flashes prior to turning the key to ACC. So what am I doing wrong? Also, turning the key in the door at one point didn't lock/unlock doors, then it did, and now it doesn't. Seems erratic, or did I enter some odd mode?