A good wheel bearing doesn't mean the sensor isn't damaged inside or went out. My front driver side front ABS sensor went out but the bearings were still good no noise or anything. Since our wheel hubs are sealed units, you cannot just change out the wheel bearing or the ABS sensor. If your abs sensor went out, you need to buy a whole new wheel hub. Or even if your wheel bearing went out, but abs sensor was good.. same thing you need to buy another whole unit.
Another thing why you can't clear the code on a normal obd2 code scanner. It is that those codes are from the ABS unit computer module. You need to goto the dealer or find someone with a GM tech 2 or Snap-on Scanners with the ABS module reader. So pretty much you need an abs scanner.
When my abs sensor went out, I drove straight to my auto school and got my old teacher to read the code on which hub it was. So i didn't guess hub/sensor went bad like others here do.
I hope this helps you out.
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I dont have an alero no more...
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