I have a 2003 A6 3.0 L that after driving and warming vehicle up when I let off the gas the OIL CAN comes on screen and beeps three times. I hear no different engine noise. I have replaced the pressure sensor and wondering what else this could be. I am going to try and replace sensor again. I also heard of a reprogramming of the ECU on these models to fix a few other issues that tolerances are different. One Audi tech said in the 27 years of working at Audi he has never had to replace an oil pump so I am ruling that out for now.