Hello and thank you for using 2CarPros. Do you have the specific codes they pulled? If there are "U" codes then there is a fault in the network. If they can not communicate with that module then three hours is reasonable to diagnose.
Unfortunately unless you can give us specific codes it makes it harder to guide you. You may just need to reset the system but unfortunately you need there system to do that? I would recommend you find an independent Nissan tech to give you a second opinion.
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Saturday, June 15th, 2019 AT 11:20 PM