I use nissan consult which you can get on ebay for 15 quid (you may need a USB adaptor for your lap top). Then get a copy of Nissan data scan from Nissandatascan.com From there you can read what the ecu is seeing etc.
ECU talk will read a fair amount of monitors and fault codes and they do a free version but you do need old .Net (v1.1 i think for it to run) will also run on an old hp ipaq as a handy tool
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