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CODE P0444 means Evaporative Emission System Purge Control Valve Circuit Open
Please check this links from Nissan forum to get a detailed idea related to this code.
http://engine-codes.com/p0444_nissan.html
http://www.permoveo.ltd.uk/tabid/122/OBD-Error-Code/P0444/Diagnostics/Nissan/Default.aspx
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