where is the boost sensor on a D3 3.0L TDI ?

It's fitted to the back side of the passenger side intercooler

Dacar 20100727120753798
 
If you can't see it or get to it from the top of the engine you would be able to get to it by removing the front half of the wheel arch liner.
 
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god you're helpful !
I was thinking about what a pain in the a** it would be to remove the front bumper :tocktock: