I'm not sure if your engine layout is the same as mine being different models. My boost sensor is on inter cooler outlet passenger side. My turbo sits at the back of the engine where the electronic actuator bolts on top. Should be a electric connector and on mine there is 3 bolts. If you locate the turbo you should see a small arm connected to the turbo and actuator,mine is held by a small circlip. I believe that on start up the small arm should move slightly ready for the drive. Mine didn't. There are few info bits on 1507 code or ask the forum under your engine model rather than the diesel section. There is a post somewhere on how to check the boost sensor but cant find it. I'm no expert but managed to solve my issue. There are plenty more posters on here that have more knowledge so hopefully between all of us your issue can be resolved.
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