You could try cleaning the sensor by spraying some volatile liquid on it, don't touch it though its very delicate, what you really need is the fault codes read.

Could there be a boost leak somewhere? Could account for black smoke (insufficient air / excess fuel) and lack of power? Would usually be accompanied by a hissing sound of pressurised air escaping.

Check all the pressure pipework between the turbo compressor and inlet for oily spatter marks.

If not then suggest gettting fault codes read as plenty of other possible causes, usually electronics...