After having the stuttering I read the codes. This is what it came back with. Can anybody define the codes and give me tips on how to fix? The help is greatly appreciated!!

1 of 2 P1615
- see service manual

2 of 2 P0335
- crankshaft position sensor A circuit malfunction

 

as far as the 1615 code, it does not come up as a valid code. i have all the shop manuals for the car and there is not even a code for 16xx at all. the 335 code is ckp sensor circuit. is the car running now or not? i know the early model 03's had a recall on the crank pos sensor, if thats you, it will get replaced by the dealer no questions asked. i know i had mine fail 100 miles from anywhere, sucked azz.
you may just be reading the first code wrong if you are trying to do by counting the blinks. get a code reader to make sure you are getting the numbers correct.

 

For 1615 I read on the Nissan OBDII, it said NAT malfunction. I have no clue what that is?

 

NATS is part of the immobiliser system NVIS. Do you want the service manual section. If so, PM me your e-mail

 

I know this is old but I might have an answer...

I started the car, sitting there I realized I did not want to wear my wool coat so I got out to take it off, rolled it up and tossed it in the passenger seat as I got back in.

Thats when it happened! The car stumbled and seemed quieter all of a sudden, SES, VDC and SLIP all came on and it had not throttle response. I shut it off and turned it back. Only the SES stayed on and throttle response was back. I opened up Cipher on my carpc and looked up the code, I had two.

P2135 Throttle Position Sensor

and

P1615 Difference of Key. BMC can receive the key ID signal but the result of ID verification between key ID and BMC is NG

Here is the funny thing, I had my wifes 03 Pathfinder's key in my pocket and I think when I got out of the car to take off my coat, I got to close to the dash and it read the key ID for the pathfinder.

I did an ECU reset per the technosquare site and the lights are all off and no codes show up.

I don't normally drive with my wifes keys in my pocket so I can see this being rare for me but I can't imagine it does not happen to others.

Chris