Ibiza – since turbocharger change problems with charging pressure sensor and black smoke

Hello, I would urgently need advice regarding my newly installed turbocharger. Since the installation the charging pressure sensor causes problems and black smoke comes out of the oil cover (with running engine). First a few facts: – Get new turbochargers installed (thereby neither cleaning of the pipes nor an oil change was done) – about 4000 km later: sporadic error Charge pressure sensor (the control light is not permanently on; when the error comes loses driving fence g of power) – to eliminate errors: Lines + charge air coolers can be cleaned -> it is found that there is a lot of oil in the charging air tube -> shortly after cleaning vehicle has power again -> after about 500 km again the same error (charge pressure sensor) – if you open the oil cover and let the engine run, black smoke comes out I would first of all be interested whether the black smoke is connected to the newly installed turbocharger or is that independent And what could the black smoke mean? In addition, I would be interested in whether an oil change + cleaning of the pipes is generally required in case of a turbocharger change.