Quote:
Originally Posted by ar0ck
Those electronics are probably for Anti Lock brakes or Traction Control.
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To further this point-
It sounds like that's the sensor on the differential for 3 channel ABS- which means you have two wheel sensors up front and a single rear sensor. You do not have traction control. Traction control requires 4 sensors- one on each wheel and no reluctor ring+sensor in the differential.