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      01-20-2015, 05:32 AM   #2
Efthreeoh
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Drives: The E90 + Z4 Coupe & Z3 R'ster
Join Date: May 2012
Location: Virginia

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Seems strange being that the ring is attached to the bearing and inside the hub assembly where there is nothing to damage it. You could inspect it through the sensor hole to check if there is tooth missing. I'd suspect the problem lies somewhere in the harness that leads to the wheel speed sensor because the problem does not follow the sensor. It could be a rodent chewed up the wiring harness somewhere after the connector. I'd trace the harness as far as I could (take the wheel line out), or take it to the dealer and have an electrical test done on the harness. If it is damaged by a rodent, your comprehensive insurance should cover the diagnosis and repair.
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