Crank sensor is situated right next to the starter, here is the procedure to access it and remove it.

1- Unplug battery terminal
2- Remove starter
3- Once the starter is remove, on the right hand side of the starter hole, remove plastic cover(Has a wire in the middle of it)
4- Once the cover is remove you will find the crank sensor.
5- To remove the crank sensor you will need an allen key(5mm), the long ones are recommended since to reach that hex bolt, you will have to work blinded, since there is no way to have a complete visual on the bolt, you will have to feel it with your fingers first and then align the allen key

Bolt if quite easy to remove and doesnt require a lot of strenght. Not sure why, but I wasnt able to upload pictures, let me know if you need them.