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Admin and Sup Mod keeping the peace
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Just like SMJ said, when replacing sensors, always use Nissan OEM parts from a Nissan dealer; aftermarket electronic items generally are not reliable, don't last long, and many times are DOA. The sensors are not very expensive; around $75. Inspect the harness connectors at all the sensors for any oxidation or loose connections. Insure that any water resistant connector is in good condition; if the seals have been compromised, then any water intrusion can cause intermittent problems.

If you install an aftermarket sensor and it sounds like it's still acting up with a long cranking of the starter (with no codes or a crank sensor code) is usually a sign of a sensor with insufficient reluctance, which doesn't trigger properly at cranking speed but does once the car fires and the reluctor wheel spins faster. It's common for cheap aftermarket CKP's and CMP's to misbehave that way.

A common problem with random engine shutdowns, difficult startups, rough running is a marginal camshaft position sensor or a marginal crankshaft position sensor. The best and cheapest fix for this situation is to replace both sensors at the same time; the reason for doing this is there is no way to determine which sensor is at fault with this type of condition. You can take your vehicle to a dealer/repair shop and they'll tell you there is nothing wrong after they go through with diagnostic tests because at that time the vehicle was running OK. You could end up spending $200 or much more depending on how much time/parts are used.
 
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