BMW fault code 0021
Stability control
In the stability control, code 0021 means different things depending on the version of the module in the car. Find your car below; the app shows the right one for yours.
Engine speed sensor front left
Module versions: Stability control ABD5 (ABD5), Anti-lock brake system ABS5 (ABS5), Stability control ASC5 (ASC5), Stability control ASC57 (ASC57), Stability control ASC5D (ASC5D), Stability control DSC3 (DSC3), Stability control DSC5 (DSC5)
In: 3 Series (E36) 1990–2000, 5 Series (E39) 1995–2003, 7 Series (E38) 1994–2001
Engine speed sensor front right trigger signal
Module versions: Stability control MK20 (ABSMK20), Stability control MK4 US (ASC4GUS), Stability control MK4 (ASCMK4G)
In: 3 Series (E36) 1990–2000
ABS valve inlet rear
Module version: Anti-lock Brake System MK4G (ABSMK4G)
In: 3 Series (E36) 1990–2000
ASC: Wheel-speed sensor, front right (trigger signal)
Module version: Stability control MK20 (ASCMK20)
In: 3 Series (E36) 1990–2000, 3 Series (E46) 1998–2006, X5 (E53) 1999–2004, Z8 (E52) 2000–2003
DSC: Wheel-speed sensor, front left, transmits no signals
Module version: Stability control DSC57 (DSC57)
In: 3 Series (E46) 1998–2006, 5 Series (E39) 1995–2003, 7 Series (E38) 1994–2001, X5 (E53) 1999–2004, Z8 (E52) 2000–2003
DSC: Wheel-speed sensor, front right (trigger signal)
Module version: Stability Control MK20 (DSC_E46)
In: 3 Series (E36) 1990–2000, 3 Series (E46) 1998–2006, X5 (E53) 1999–2004, Z8 (E52) 2000–2003
Reading and clearing it
Fault code 0021 is a BMW code, stored in the car's stability control, 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 stability control is on: 8 Series (E31), 7 Series (E32), 5 Series (E34), 3 Series (E36), Z3 (E36/7), 7 Series (E38), 5 Series (E39), 3 Series (E46), Z8 (E52), X5 (E53)
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