Try this:
To reset "CHANGE OIL" light, turn the ignition switch to the run position without starting the engine. Fully depress and release the accelerator pedal 3 times within 5 seconds. and wait for the light to flash.
I don't think the 'gas pedal way' works on this year. The correct way to do it:
Turn key to ON - do not start. Press RESET button in driver's side fuse box. Change Oil light on dash should start flashing. Now Press & Hold RESET button until the Change Oil light turns off & you here 3-chimes.
This method will also work on a 2000 Grand Am
Turn key to ON - do not start. Press the RESET button in driver's side fuse box multiple times (3 to 5) until the Change Oil light on dash start flashing. Now Press & Hold RESET button until the Change Oil light turns off & you here 3-chimes.
How to reset service light on a 2004 grand am
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The ABS light on a 2004 Pontiac Grand Am can be reset by connecting an OBDII code reader to the vehicle's computer. It can reset all codes and determine their cause.
Have the SRS repaired by a qualified technician and they will reset the light.
http://www.gminsidenews.com/forums/f53/98-grand-prix-change-oil-light-stuck-59318/ For a 98 but same process.
Turn the key on. Depress the gas pedal and release 3 times slowly. Should reset it.
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Driver side fuse box there is a switch you push to reset.
turn the key in the on position without starting it and press down on the gas pedal three times and the change oil light should start blinking
turn the ignition to "Run" or where it would be once it was started, but dont start it. quickly push the gas pedal to the floor three times. the change oil light should start flashing and it will reset.
after the cause of the code is repaired, you reset with a scan tool, or by unhooking the battery.