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Old 10-27-2012, 03:15 AM   #6
lucky_doggg7
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Join Date: Mar 2008
Location: OC
Posts: 282
My Ride: 2005 M3
http://forum.e46fanatics.com/showthread.php?t=832859

There is an ECU fan right above the footrest; it's making a chirping sound to indicate that the useful life of the fan is coming to an end. To verify, get down in driver footwell, after you adjust the seat fully back; pull the carpeting back for better viewing just to make sure and listen for the little birdie (chirping sound). This is a well documented issue with the M3 also, so don't feel singled out. See the attached post.
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