Purchased a used BMW X3 that has been in and out o...

Purchased a used BMW X3 that has been in and out of the shop. Had to take it to an independent to get the issues diagnosed who then told me that codes had been cleared regarding issues I had reported (from the dealer I assume). I know the vehicle was used, but I was told that it had been thoroughly inspected. How could I have so many issues if this was the case? Since purchase less than a year ago, I have had to replace a washer pump, ignition coils, transfer case actuator, rear main seal (at least covered under warranty), and now the brake powerbooster and crankcase pressure valve are bad. The last item was related to the rough idle I had repeatedly reported. If I had any confidence in Hendrick, I would just bring the vehicle and ask for a good trade value toward something else. I don't see this as an option since I have no idea what they would sell me if given another chance.