reset the system by the ff procedure,
Insert the ignition key to the LOCK position with the odometer showing.
Turn the ignition key to the ON position while holding down the ODO/TRIP button at the same time.
(Make sure you don't start the vehicle, just turn the key to the "ON" position)
You need to hold down the button (ODO/TRIP) for at least 5 seconds, this cause the odometer to goes back to "000000"and the lights goes off.
(this procedure will only reset the Engine oil replacement reminder, but not the actual odometer mileage.) Hope this will help you if you haven't done it yet.