Well the OBD port can is for diagnostics. Assuming they can read everything that way, do firmware updates etc, that's probably enough for them.

Surely there's a way to "gateway" from the CAN-C at the diagnostic port to CAN-B bus and that's how the diagnostics work?
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Christian
#40104192 120Gb (no longer in my E36 M3, won't fit the E46 M3)