Oil leak Ford Focus.

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 I have a Ford Focus 2008 1.8 Tdci. Recently I noticed a problem when driving the car there’s a whistle noice coming from the turbo when it kicks in, it sound like a hole in a pipe someplace and is letting out air, when I lifted the bonnet I noticed an oil leak near the oil cap beside a sensor (seen in  picture), I checked the turbo and the turbo is all ok as the car never lost the power and there’s pressure on all pipes when turbo kicks in, 

what is this sensor and would it leak oil and could this be the solution to my problem? Would this cause a whistle like an air hole when driving? 




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