I have an 09 XF Premium Luxury, I am trying to repair myself. Does any one know what this is and where it is supposed to be mounted?Thank you for any assistance.

 

Yes that's your TPMS antenna. There are 2 at the front of the car and should be in some kind of bracket and not hanging loose.
Let's see if the mods can move your post to the XF section so people with your car can take a look?
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There are snap in brackets on the valence panel in front of each front wheel. I don't have a picture but you could check the parts catalogue.

 

 

Good diagrams! Thanks.
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Thank you very much, that is a huge help.

 

If it doesn't firmly snap into place, I suggest also to use a ziptie to hold it in its little pocket otherwise it will likely bounce out again.