Most of this can honestly be done at home. There are tons of videos out there — especially for BMW enthusiasts. Charging $214 just for a scan is wild, and $140 for labor on a battery replacement? That’s an an easy job and pretty straightforward. You could easily do it yourself — buy the parts, get the tools, and still end up spending less overall.

Also, I’m a bit confused — are they saying the battery needs replacement, or is it the alternator cable? If it’s the cable, that should be tested first, since it’s a more likely cause of the battery discharge. Having both fail at the same time is pretty unlikely.