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I had a BMW with encrypted CAN or very similar to what that would be. Would refuse to use a new module unless you had the dealership key. Which my mechanic managed to get from his friend at the dealership but still...

Needless to say, never again

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That started with the high intensity headlights. They were such a high theft item that when they're disconnected from the battery, they go into a locked state that requires a dealership to do the unlock.

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