Engine Mechanical problem
2004 Nissan Sentra 4 cyl Front Wheel Drive Manual 62000 miles
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I had a check engine light come on. I had the code read at auto zone it was the crankshaft position sensor. I replaced the sensor and the light went out but now the car idles at 1500 rpms then goes up to 2000 rpms and back down. The idle just keeps going up and down. The only thing that stopes the idle from going up and down is when I turn the a/c on then the car idles ant 1100 rpms and does not go up and down. The check engine light is still off and the people at auto zone read the car again and their are no hidden codes. How or what can I do to get the idle to go back to 700 rpms where it was before. the car is an SENTRA SE-R SPEC V

Sorry...I wish I could help, but unfortunately I haven't been able to find the crank position sensor on my 2004 Nissan Sentra Spec V. Considering that you just replaced it, can you tell me where is it is located? And how long it took to replace? AutoZone also diagnosed my sentra as having a bad crank position sensor as well.

You will find it below the throtle body near the back of the motor close too the bell howsinng of the transmission. It's between the motor mount and the engine block. I found the best way to get to it was to go from the top of the motor and not from under the car. You can buy the part from Auto Zone this will help you have a better idea of what to look for when you start looking. The Auto Zone part is a Duralast Part number SU6364. It took me an hour of surching before I found a diagram that showed me where it was, and it was not a very good drawing at that. I hope this helps you.