I already used the reset option in the oil change category in the infot screen. Not solved.Do you have a "Reset" option in Oil Change catagory under Maintenance Monitor from infotainment screen? Have you tried pressing the dash light adjustment stick method mentioned in post #14 by ManUtd?
The Oil Change part of Maintenance Monitor App on new CX-9 is a little different from CX-5. I got feeling that Mazda rushed this change from CX-5's which is based on, and it seems like an incomplete job and it's even showed in the owner's manual.
But I see post 14 above and will follow instructions to see if the described procedure works.
I will post results today.
Enviado desde mi Samsung Galaxy S7 Edge.