Q: crankshaft position sensor location on 2004 Nissan Altima

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Where is the crankshaft position sensor located and how much time would I expect to spend replacing it?
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Need to know which engine you have i.e. 4 cyl or V6 to give an exact estimate as the sensor is located on different areas of the engine.
the 4 cylinder has the Crank Sensor on the right rear of the block below the starter motor. the V6 has it lower left of the block. The V6 Sensor costs about $100 and the 4 cyl is about $50. The labor is .6 hours for both engines, so this is a pretty good idea of what to expect in terms of cost.
thank you.Is it 2 wire or 3three wire?And do you know what the sensor is on the top of the motor with 3 wires?Please help