Maint req light on but...

Oil level doesn't matter; it's how long since the last reset. It is designed to be reset manually at each oil change. 4500 miles later it will flash on startup, and then at 5000 miles it stays on. Reset instructions are in the owner's manual.

 

If it is in the manual I have not found the right item. Do you know what it is listed under?
Rsuetterlin

 

I had to reset the light myself a couple of weeks ago because my mechanic forgot to do it. This is from the 2007 owners manual ("Service reminder indicators and warning buzzers" section), but I think it should be the same for 2009:

The system must be reset after the engine
oil replacement. Reset the system by
the following procedure:

1. Press the “POWER†switch to the
“OFF†mode with the odometer reading
shown.

2. Press the “POWER†switch twice to
select the “IG-ON†mode while holding
down the trip meter reset button.

Hold down the button for at least 5 seconds.

The odometer indicates “000000â€
and the light goes off.

If the system fails to reset, the light will
remain flashing.

 

In my manual it is listed under "Engine oil maintenance data"
Page 369. And it does work.