Does your code reader give data? Have you checked to see what the values are in ECM data or did you just see a code and throw a part at the car hoping it would work? You need to see what the baro reads usually in kpa KOEO (key on engine off) and see what the baro is at your see level. Also check it running, not sure if there is a specified value engine running from Nissan but if NA then it should never be a positive value. If it is something that is intermittent then you need to check freeze frame data and see what the value is at the time the code is set, this will give you clues as to if you have a intermittent open or shorted wire possibly bad connector terminals too. You have already changed the sensor and still having an issue, odds are cleaning the new sensor won't do anything for you. Besides never heard of anyone cleaning a MAP sensor with any success it is not like a MAF sensor.
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