302600 is a fault stored in your BMW's memory (an ISTA fault code, not a standard OBD-II P-code).
What it means: Encoding/teach-in: the teach-in (initialization) of at least one component did not complete. This is usually NOT a problem — it's a normal side-effect of coding changes, equipment/retrofit changes, flashing, or adding a function tied to the engine control unit (DME). It's logged for information; usually nothing needs to be done.
