Reset service light indicator, engine oil life Buick Century, year 1998-2005 reset instructions:

1. Turn the ignition to run (one position before starting engine).
2. Immediately after Step 1 press and release the gas pedal 3 times within 5 seconds.
3. If the CHANGE OIL SOON indicator flashes
4. Turn the ignition off and start the engine to verify the indicator has been reset.