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      12-06-2012, 08:33 AM   #6
pbonsalb
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Drives: 08 E90 M3, 99 E36 M3 Turbo
Join Date: Feb 2011
Location: Concord, NH

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Shadow fault is sort of a BMW ECU "pre-CEL" as I understand it. Could be triggered by a number of things, probably including improper AFR pre or post cat, but again I don't know much about shadow faults.