If I remember correctly, no matter what mode I'm in when I turn it off. It reverts back to Normal when I start it. I haven't driven it in a few days... I'll try in Sport mode and see if it sticks.Does your BS return to the default mode or stay in Sport mode when you restart? I haven't quite figured out whether the modes are persistent for some period of time or not. I noticed I stayed in Sport mode after a fill up once but have not seen that happen again. Maybe a factor of time?