Wheel Speed Sensor: Notes
WARNING: This page does not describe the selected car, but rather 9 other vehicles, including the 2001 Pontiac Sunfire, 2001 Pontiac Grand Am, 2001 Oldsmobile Alero, 2001 Chevrolet Monte Carlo, and 2001 Chevrolet Malibu. However, it is still accessible from the selected car via links, so may be relevant.
NOTE:
The front and rear wheel speed sensors and toothed sensor rings (tone rings) are part of wheel bearing hub assembly and must be replaced as a complete assembly if defective.