The Maint Reqd light is only on North American NHW20 Prius.
At 4500 miles since last reset, the Maint Reqd light will blink at you on startup (very easy to miss seeing it). At 5000 miles since last reset, the Maint Reqd light will stay on solid.
It's just a reminder by miles that you are due for the next scheduled maintenance. It is not smart (doesn't go by time, or do any oil analysis), just a mile counter. Usually that is an oil change/tire rotation:
http://smg.toyotapartsandservice.com/
Should your dealer forget to reset it, or you go to an independent mechanic or DIY, you can reset the light yourself.
Page 122-123 of the US 2004 Prius Owner's Manual (Section 2-5 "Operation of Instruments and Controls: Gauges, Meters and Service Reminder Indicators", item (j) in the "Service reminder indicators and warning buzzers" section.), or a similar section in your model year's owner's manual.
http://autos.groups.yahoo.com/group/...tm#maintenance
http://www.vfaq.net/FAQ-screen.html#maintenance
page 14 of the User-Guide:
http://john1701a.com/prius/prius-userguide_iconic.htm
how do I extinguish maint. required light on 2007 Prius?
Linear Mode
