Nissan Repair: Camshaft Sensor

Question
QUESTION: My car started misfiring but still ran fine, so I hooked up my OBD and
It said it was the camshaft sensor. So I went to the store and bought one. Hooked it up, and the car wouldn't start AT ALL. I put the old one back on, started up fine. I thought it may of just been a faulty product so I took that one back and got a new one. Hooked it up and once again, it would not start! Put the old one on, and it cranked up. With misfiring and all but at least it works.
So do you think it is likely that I got two faulty products from different places? Do I have to reset the car or anything to get it to recognize the new sensor? Is there anyway to test the sensor to see if that is the problem?
Maybe there is something else making it misfire. If you have any suggestions I would greatly appreciate your help.
Thank you in advance for your time.
Car: 06 Nissan Sentra

ANSWER: Hi Blandy -

Where did you get the sensor from? Is it aftermarket or OEM? Although more expensive getting genuine parts are more reliable.

Also, to ensure the part is matched correctly, check with the dealer matching your VIN number to the part number needed. Sometimes there are errors there.

Let me know how this goes -

Aloha
Calvin

---------- FOLLOW-UP ----------

QUESTION: I bought one sensor from Auto Zone and the other I got from my local mechanic. My mechanic friend got on his work account and double checked to make sure I had the right part. That is the main reason this is so baffling.
I assume the part number was right but I guess I may want to double check that.
If I did get the right part, is there any other reason it would fail to crank with a brand new sensor and actually start with the old one? Do I have to do an reset or something to get it to recognize that I replaced the sensor?

Answer
Hi Blandy -

There is no reset required for a new sensor. The only reason I can think of is it is the wrong part number, or it is indeed a faulty part, although unlikely, not impossible.

These sensors operate by millivolts, so very sensitive and fail easiliy.

Hope this helps -
aloha
Calvin