The link that Q posted has a link to the "Low Cost" sensor and that is the antenna that is between the muffler and the differential, part number 36236771043. I'll be going under this afternoon to hopefully find and replace it. New wheel sensors didn't fix it for me.

Thanks Q for the link. I'll try to take a pic of it too when I find it.

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'01 740i Sport MKIV, Quad Brake Lights, Bi-Xenon retrofit, HID Fogs Dinan 7 Struts, Springs, camber plates, Intake, MAF, CAI, Throttle Body, NBT Retrofit, Strong Strut


'99 318ti Titanium Silver; '97 318ti Boston Green; '13 X5 3.5i Saphire Black Metallic
'84 633csi Black (sold); '88 325iC Black (sold); '97 740iL Black(sold); '01 740iS Black (sold);'97 318ti White (sold); '08 X5 4.8i Titanium Silver (sold); '96 318ti Alaska Blue (sold)