Originally Posted by jwscfa

Not so good news on my X5 3.5d. The dealer has told me that the software update went smoothly as did the replacement of the sensor. I am not sure of the technical name of the sensor but I was told the one in question was in the turbochargers. The problem arose that when the original sensor was pulled for replacement it had oil on it. Not sure if it was engine oil or another type but either is not good. They are keeping the car to confer with BMW in trying to determine the cause of the oil. I have noticed no excessive drop in engine oil levels nor any smoke to indicate an oil leak. I will post again when a final diagnosis and fix is reached.