BMW fault code A21E
Auxiliary control unit
SEC1: Limit switch, bottom, door, rear left
Module version: Auxiliary control unit (SECUR1)
In: 7 Series (E67) 2002–2008
Reading and clearing it
Fault code A21E is a BMW code, stored in the car's auxiliary control unit, 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 auxiliary control unit is on: 7 Series (E65), 7 Series (E66), 7 Series (E67)
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