Hello to all people am new to this Fourm, I have X5 E70 Model now this car I’ve never had a problem until now. It’s 2011 plate with 80,000 full Bmw service had the car for 2 years now... I notice a small jerk when accelerating to 40 or above been told it’s got cheap tyres on so I need genuine tyres but I was thinking all that time the car was fine... what I’ve notice is the car won’t select in sport mode ? Any help please ?.. really appreciate it thanks.