I am the owner of a 2000 S80 2.9 that is reporting OBD Code P1633. I also see the WarningMessages for "Brake Service Required" and "STC Service Required" displayed. The ABS and STC warning lights also come on then off. I also notice the trip odometer displays"dashes" for a short time, then displays the correcttrip mileage again.
Could this be a bad ABS Control Module or a problem withone of the speed sensors.
The car has new brakes and up-to-date Warranty Service.
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