My w220 got low on transmission fluid and i thought the transmission was going. It was driving funny it felt like it was dragging when i took my foot off the gas. It didnt have that free coasting feeling. And it wont go into sport mode. So i checked it and found out it was super low on fluid. And now i put the fluid in it and thats fine now. But the car still will not go into sport mode and its still have that slight dragging feeling when you take your foot off the gas. Im wounder what can i do to fix it ? Or can i reset the transmission since it has new fluid in it now?