Clear the codes, give it a nice polish, stop by your dealer and trade in the sucker. In the long run, you'll eventually lose more than the car is worth plus a ton of headaches.
I understand people 'love' their cars (whatever humans-metal love is) but it's not worth it.
First day my CPO expires (Jan 1st, 2018) my X5 is gone. I'd rather drive a Chevy than dealing again BMW problems. I remember years ago I had a 325. Boy, what a headache. Months of trying to figure out all problems, tons of money spent on parts and I ended up trading it. It was so frustrating.

__________________
2012 X70 XDrive 35i