What is the problem with the HPFpump on the 335i? Mine went out at 7000 miles for no particular reason. The 08 335i coupe has been driven conservatively, with full break in as suggested. The car went to limp mode while at a steady 40 MPH. I have now read of many owners with this part problem. Has the replacement been upgraded or recalibrated or should I expect another failure in due course. The dealer replaced the part immediately, but now creeping doubt about this component is present. Any expert opinions out there?