High pitched squeek upon light acceleration on 2006 BMW 330i

I have a high pitched squeeking noise upon light acceleration. It seems to be inconsistant. But, you can hear it. Any ideas on what it could be?

by in Springfield, MO on April 08, 2011
3 answers
ANSWER by on April 09, 2011
Sometimes you can hear a similar sound when the breather system (PCV) failed. A BMW specialty shop should be able to check the PCV pressure with a manometer. Zee
ANSWER by on May 02, 2011
parking brake. just had mine fixed
ANSWER by on May 17, 2011
If the sound is originating from the right rear wheel, it may be the brake pad wear sensor. It apparently will "flex" enough and make contact, producing the squeak. Really annoying; a local BMW shop should be able to adjust it, but it may set you back ~ $100. Design-flaw.