My car runs smoothly most of the time; however, as of last week, iy has issues

The first code was a sensor that seemed to be acting as if the car was in frigid temps rather than 100 degree heat in South TX, the next time the code stated misfires and needs a full tune-up, the third time, it had a list of 8 codes (including the first two) but after they reset and tried again, it showed no codes although the problem still existed.

Lol well that's not a lot more info. I would suggest you get that to a technician familiar with euro vehicles and their diagnostic procedures. You could easily have a simple sensor malfunction causing your issue. However maintenance is extremely important to any vehicle, stay current or you'll run into even worse problems. I personally do all maintenance items early and have yet to regret it, and I think the euro maintenance scheduled intervals are too long. Personal opinion, and we all have one. Anyway, get your vehicle to someone that knows Beemer, it'll be less guess that way, and less $$ when it's all said and done.

Will do and thank you very much!