2008 A4 B7 Avant 2.0 tdi. Econ light came on and stayed on. Had a mobile guy come and check it out. Pressure test showed leak from sensor, could hear it. That was swapped and taken to a Vag specialist to get the fault code cleared. Came up as $333/00819 030 High Pressure Sensor, open / short circuit to B+ Code cleared but came back again. reported this to the aircon guy who admitted he didn't fit a genuine Audi sensor. He is returning again to fit the proper one when he gets it. Question is, would a pattern part throw this fault code and will the genuine one clear it? Or am I looking at something more sinister and expensive?