How do you reset the change oil light on a 2000 Alero?
On the left side of the drv'r door you will see a fuse panel. open it, turn the ignition to on position, pres the reset button once, the light will start flashing, press and hold the reset button till the light goes out. Note also works for the tire pressure light.
Also if you have been trying other methods, you can reset the codes by disconnecting the negative battery cable then connecting it. Then use the above method. It is in the owners manual