My sensor also went bad. I cleaned it out by pouring some rubbing alcohol down the hole shown in the photo above. I then scraped out a ton of black goo with a small screwdriver. The X5 ran much better but was not perfect until I replaced it. I started this process monitoring manifold pressure with Torque for Android. I bet you are going to see some incorrect boost levels.

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2009 35d, 2006 325i & 330i