what is the diagnosis code for a faulty crank posistion sensor?

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I replaced the ECU, (On the advice of my Nissan Tech). Two weeks later I still had problems, car dies and wont restart for aleast 20mins. Thats when he told me they usualy replace the I.A.C.V. and the T.P.S. With my wallet over $600 lighter, my sentra still drives like S#!t.