Maint Required Light on 05 Avalon

It's easy Jim. With the ignition off, push in and hold the odometer selection stem. Turn "on" the ignition, don't start the car. You will see the odometer "count down" in dashes (------). Wait until the count is done, (it should be showing current mileage), release the stem, turn off the ignition. Done.

You may want to do this every oil change service.

If you have your owners manual, I know the reset procedure is in there. You can check it, it's probably a bit more detailed. Good luck.