Has any one tried to program a third key using the following method described below . Is there a method that does not require a Dealer or a Locksmith.

When the dealer or locksmith programs your car to accept a second key with the computer (when you have none or only 1 available), there is a delay imposed by the car computer (I think it is 10 - 15 minutes depending on the vechicle). This LONG delay supposedly stops someone from making a physical copy of your key and then quickly programming it into your car to get a working copy of your ignition key (possibly without your knowledge). I guess they feel if you already have 2 working keys in your posession you must be the owner, so it's OK to accept another key code more quickly. You can program a third key (up to 5 total) yourself, if you have 2 already programmed keys. The exact procedure varies between car companies, models and model years, but the general procedure goes like this...

1) Have 2 working keys, and close all doors (some models).
2) Insert key A into the ignition
3) Turn ignition to the ON position (don't start the car) and wait for some amount of time (normally 1 - 5 seconds or so).
4) Turn the ignition back to the OFF position and wait for some amount of time (again, normally 1 - 5 seconds or so).
5) Possibly repeat step 3 and 4 up to 4 more times (depending on model).
6) Remove key A and insert Key B into the ignition.
7) Repeat steps 3,4 and 5 with key B.
8) Remove key B and insert the unprogrammed Key C and turn the ignition to ON (again don't start the car yet).
9) Wait for some amount of time
10) On some models start the car with new key C, but doing this on some others will terminate the programming sequence a this key.
10) If a Key D (or E) is required , repeat steps 8, 9 and 10 with Key D (or E).

If you already have 3 keys programmed, and you try to program 3 more, the key that was used longest ago will be removed and replaced by the last key programmed.

 

lol that sounds like the procedure for programming the keyfob.

 

There is no DIY for programming the key...you'll have to shell out, and a locksmith is the cheapest bet, just make sure you get a locksmith who can program Nissan Transponder keys...