I took my BMW in for service,,,When I booked the appt. I asked if they could reset the sensor that said "service do" after the work was done. He told me that would be no problem. After the service was done I asked again if the sensor was reset answer "yes". The next day when I started the car it said "service do" So I had to take the car back again to reset the sensor. This time it was taken care of. Not a real big deal but I did have to make an extra trip.