Is it throwing an ABS light? If so sounds like it needs a hub assembly.
Scan it..
Also don't just replace the sensor... 10 out of 10 times the bearing is on the way out because the sensor threw shavings into the bearings... And they are eating themselves up... Plus it's cheaper to buy the whole assembly...
That is normally the case.. but on rare occasions cars that sit for a period of time will develop rust on the rotors and as soon as you drive it the rust gets turned into dust that gets into the sensor too. Nothing you can do except replace it.
Also Reiko, i need a price on a hub assembly 2000 Bonneville SLE.. PM me.