My 98 required a Tech2 type scanner to read ABS codes. My ABS light was the right front sensor. The sensor is integral with the hub bearing. When the hub bearing starts to go, it takes the sensor out.
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98 Riviera SC3800 All stock except gutted air box.
1970 Buick GS455 Stage1, TSP built 470BBB, 602HP/589TQ
Best MPH, 116.06 MPH, Best ET, 11.54
https://www.youtube.com/watch?v=UHCda-t_Jls
https://www.youtube.com/watch?v=sfT2tEO4XcU