I am new to this forum. My Q50 has generated ABS, Chassis Control System and AWD system errors on 3 different days, each time well after start up and while driving on the highway. The first time, the warnings went away with no action. The second time I took it to the dealer. The dealer said a bad connector was at fault and replaced it. When it happened a third time, I took it back to the dealer. On the way, the engine surged and I looked down to see the speedometer jump from 70 down to 40 and back up. I was told the car needs a new sensor so I left it there overnight. They called me back the next afternoon to tell me the part is on back order until Jan 14th and to come get the car. I am concerned about safety, since the owners manual says not to drive it with that condition. So, after getting the husband involved, I am now driving a loaner while my brand new, beautiful, pricey car sits in the dealers parking lot. At this point, I couldn't be more frustrated with the car and the dealership.