Reset service light indicator, engine oil life Honda S2000, year 2000-2007 reset instructions:

2000-2005
Turn the ignition off.
Press and hold the TRIP METRE RESET button while you turn the ignition switch to run (one position before starting engine).
Continue holding the button until the indicator resets (indicator light goes out).
Turn the ignition off and then start the engine to verify the indicator has been reset.
2006
Turn the ignition to run (one position before starting engine).
Press the TRIP button until the engine oil life indicator is displayed.
Press the trip button for more than 10 seconds. The engine oil life indicator and the maintenance items code(s) will blink.
Turn the ignition off and then start the engine to verify the indicator has been reset.
2007
Turn the ignition to run (one position before starting engine).
Press the TRIP button until the engine oil life indicator is displayed.
Press the trip button for more than 10 seconds. The engine oil life indicator and the maintenance items code(s) will blink.
Press the TRIP button for more than 5 seconds. The maintenance items code(s) will disappear, and the engine oil life will reset to “100”.
Turn the ignition off and then start the engine to verify the indicator has been reset.