The crankshaft position sensor should be at the front of motor tucked up behind starter. You will need to remove starter to replace sensor. I tryed to get you a pic but could'nt locate one. But here are the removal procedures: Disconnect the negative battery cable.
Remove the air cleaner box
Loosen and relocate the starter motor,
Disconnect the electrical connector (Crankshaft Sensor - 4 Cylinder).
Remove crankshaft sensor bolt.
Remove the crankshaft sensor.