BMW fault code 004B
Check-Control Module
Error Watchdog
Module version: Check-Control Module (CCM38)
In: 7 Series (E38) 1994–1998
Reading and clearing it
Fault code 004B is a BMW code, stored in the car's check-control module, not a generic OBD2 code (P0xxx): a generic OBD2 reader only reaches the engine's emissions faults, so it won't show it. AutoLingo for BMW reads it with BMW's own diagnostic protocols, in plain English, with the details the module stored about it, and clears it after a repair. If a fault comes right back after it's cleared, the problem is still there.
The check-control module is on: 7 Series (E38)
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