The maintenance required light, or "Maint Reqd" as it's displayed on the instrument panel, on the Toyota Prius is not to be confused with a check engine light. The maintenance light is designed to come on at service intervals to inform the owner or driver that it's time for an oil change service on the hybrid vehicle. For do-it-yourself oil change enthusiasts who own a Prius, this procedure takes less than a minute and requires no tools. You should reset the light after each oil change service so you know when the next one is due.
Start the Prius with the push button ignition system.
Set the trip-odometer display on the instrument panel to the odometer setting (not the trip mileage, but the actual mileage of the Prius).
Power the Prius down by hitting the ignition button again.
Locate the odometer-trip button located near the center of the dashboard.
Depress and hold the odometer-trip button with your right hand and then power on the Prius with the ignition button with your left hand.
Continue to hold the odometer-trip button until the "Maint Reqd" light goes out on the instrument panel.
