This is definitely not a do-it-yourself repair. A lot of independent shops won't even work on these systems due to lack of training and fear of liability issues if it fails and causes you to have a crash. Also, the electric / hydraulic steering gears are very expensive. If a shop owner orders one and it doesn't solve the problem, what will they do with the part?
We don't get involved with costs here because there's way too many variables. We don't even know what's wrong yet. There could be a simple corroded electrical connection or something broken in the steering gear. Those steering assemblies on Nissans can cost over $5000.00. Yours may not be that expensive, but at least you can see why there's no way to determine what the repair will cost.
Your best bet is to visit the dealer. They will have the training and special tools to diagnose the problem.
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Tuesday, June 17th, 2014 AT 11:19 PM