[F82Steve]

I have a 2015 M4 and my check engine light has come on. I was told there was two codes and this is the second time I have had to bring it back to the dealership for repairs.

Code: 12B304 Lambda probe heating after catalyst activation: Line Break

Code: CD0487 Central Gateway: Synchronization failed.

Anyone have a clue what these codes mean?

Car is currently at the dealership (2nd visit).

Thank you!