:welcome: to TN!

Its not a oil level warning, it won't auto reset after an oil change. Its programmed to come on every 5k miles. The nav has nothing to do with it (I tried the same thing first time :lol, its built into the ECU.

To reset it:

Turn the car on. Using the trip meter (mileage screen in gauge cluster), change it to trip "A".
Turn off the car.
While holding the stick that controls that screen down, turn the car ON again and keep holding the stick.
You will see a screen come up on the multi-information display. It will say resetting oil data (or something like that). Keep holding the stick down until it says complete. And your set.




EDIT: hang on...is it on the mini 3" screen or the navigation screen??

 

mini 3" screen

 

Ok then that should do it. That's how you do it on the non hybrid 2nd gen and it should be the same for the hybrid. I can't check to be 100% sure because the toyota manual site is down for maintenance unfortunately, but its worth a shot.