Hello I will help you with your question,
The sensor looks like this
Follow these directions to remove it
Let me know if you have further questions about this procedure
I am not sure what voks are?
There is a bolt that you loosen/remove and the sensor pulls up.
You have both timing covers off?
Can you see the bolt that holds the sensor in place?
You will have to pull it slightly away from the head and pull straight up while wiggleing it. I have never had much trouble getting it out. Can you see what is holding it in place?
If you have both covers off that should not be a problem, fish it out with a magnet.
It is not necessary to remove the timing belt but here is the installation procedure
Line up the marks,
Set the tension on your used belt 4mm past the vee in the notch of the tensioner
Once you have the tension set turn the engine over by hand two crankshaft revolutions and recheck the marks
Let me know where you are having a problem