Klaus -
Had Autozone read the obd code - P1550 (translates to ECM-510F; check engine light comes on and a message sent to the ECM if a fault in the vehicle speed signal has been detected in the ABS control module). Still sounds like a wheel sensor or wiring problem to me.
One other thing, when Victor put my original ABS Control Unit in one of his S80s, it worked fine. I opted to have him upgrade my unit anyways to avoid a future problem, but still had the same problemswhen I reinstalled the unit.
Thanks again.
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