Originally Posted by auger330
They were all hidden codes, no alerts on the dash. No i can't know for sure if the errors came post battery swap but I have to assume it since registering the new battery fixed the errors. If the weak oem battery caused the voltage issues i don't see why the new battery wouldn't have fixed it. Either way, it's irrelevant--the registration fixed the voltage issues.
Errors don't fix themselves. They get registered in the car's log, and they are still there, even if the problem for the error goes away. They can only be erased by BMW or someone with a scan tool.
Neither did the registration process fix any errors. They just cleared the codes that were there (probably) from before the battery swap.
I think we are back to square one.