So I got the DSC/BRAKE/ABS light issue. I flipped the gear in the transfer case motor and it didn't solve the issue. Mechanic recommends replacing the transfer case, which is quoted at around $4K.

Any advice?

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1978 E21 320i 1980-99
1985 E28 533i 1999-2001
2006 E53 X5 4.4i Build Date 6/06 2012-