That code is p1320, primary ignition signal.
Possible Causes:
Faulty power transistor unit built into ignition coil
Ignition primary circuit is open or shorted (circuit to ignition coils)
Ignition primary circuit poor electrical connection (circuit to ignition coils) Faulty ignition system condenser
Crankshaft position sensor circuit
Read more:
http://www.autocodes.com/p1320_nissan.html
Thought it was kinda strange, was running really well.