Answer
The "change oil" light on a 2001 Grand Prix is reset by pressing the gas pedal three times while the vehicle is in "accessory" mode:
1. Turn the car off.
2. Place the ignition key in the "on" position, without starting the car. That is, turn the key forward to the place right before it fires the engine.
3. Place your foot on the gas pedal and press it all the way down three times, waiting approximately one second between presses.
If done correctly, the "change oil" light will flash repeatedly, and will then reset.
Please note that it is rare to do this successfully on the first try; if it does not work, turn the car off and try the procedure again, varying the wait slightly between pedal presses at each attempt
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