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Hello and welcome to just answer. I need to ask a few questions so I can get a picture to better help you.have you checked for any codes ? had the fuel system cleaned?
LOL now you know why we go bonkers. Well if one code is relating to the crank angle that would be your crank sensor or it's circuit. I really don't know why they can;t put it on a scanner and read all these sensor inputs and wave patterns how they are performing? Looks like they are guessing. Have you got an vacumm gauge to check manifold vacumm? ask them to check your map sensor and or the air hose going from the air cleaner to the throttle body for tightness and any cracks. could you get me the exact codes they had would help here.
I had written a booklet on how to deal with this very type of service your getting. What I recommend is to escalate to the manager if no resolve , the owner ,then to Nissan customer service. Don't lie down and take this if you spent your hard earned money there on one of their products. tell them exactly what you told me . They obviously are screwing you around because if something wasn't communicating with the ECU they would have a code. I looked and can't find any code with those numbers you gave me. I will give you a link and you can look yourself at all the codes applicable to your vehicle. If you do not want to see if Nissan customer service can help let me know and we can proceed but won't be easy. http://www.troublecodes.net/nissan/