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I'm not 100% sure, and I'm not sure where to look to confirm.

It's a 2002 Sentra ser specv

I can connect to the ECU, though I have to search for it every time I hook up before it will actually connect, and I can connect to the OBDII, but no matter what I try adjusting, I can't connect to the BCM. Any ideas?

Thanks!

I have installed the new immobilizer and tried to re-program the key with the same PIN code I used successfully before, 5523, and now it's saying it has failed to program. Do you have any suggestions as to what I can do to get this new immobilizer programmed?

That is pretty much what I thought. I guess the next step is to try replacing the immobilizer.
Thanks!

I have a 2002 Sentra SER SpecV, and the Immobilizer has gone out on it. I tried re-programming the keys, and got the car to start up, using both keys, two separate times. But the next morning it wouldn't start at all. Is there anyway to completely bypass or disable the NATS system?