BMW fault code 0021
Engine electronics
In the engine electronics, 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.
Fuel injector cylinder 5
Module versions: Motor Electronics (MS410DS1), Motor Electronics (MS410DS2), Motor Electronics (MS410DS3), Motor Electronics (MS411DS1), Motor Electronics (MS411DS2)
In: 3 Series (E36) 1990–2000, 3 Series (E46) 1998–2006, 5 Series (E39) 1995–2003, 7 Series (E38) 1994–2001
Fuel injector cylinder 3
Module versions: Motor Electronics (DM338DS0), Motor Electronics (DM338DS1)
In: 7 Series (E38) 1994–2001
DME: Function, inlet-camshaft control, bank 1
Module versions: Motor Electronics (ME72KWP0), Motor Electronics (ME72KWP1)
In: 3 Series (E46) 1998–2006, 5 Series (E39) 1995–2003, 7 Series (E38) 1994–2001, X5 (E53) 1999–2006, Z8 (E52) 2000–2003
Injector 4
Module version: Motor Electronics (BMSS501)
In: 3 Series (E36) 1990–2000
Control unit ECAT
Module version: Motor Electronics (DM5212R6)
In: 7 Series (E38) 1994–2001
Fuel injector cyl. 5
Module version: Motor Electronics (MS410DS0)
In: 3 Series (E36) 1990–2000, 3 Series (E46) 1998–2006, 5 Series (E39) 1995–2003, 7 Series (E38) 1994–2001
DME: Activation, fuel injector, cylinder 5 (OBDII: P0205; EUIII: P0205)
Module version: Motor Electronics (MS420DS0)
In: 3 Series (E36) 1990–2000, 3 Series (E46) 1998–2006, 5 Series (E39) 1998–2003, 7 Series (E38) 1998–2001
DME: Activation, fuel injector, cylinder 5
Module version: Motor Electronics (MS430DS0)
In: 3 Series (E36) 1990–2000, 3 Series (E46) 1998–2006, 5 Series (E39) 1998–2003, X3 (E83) 2003–2010, X5 (E53) 1999–2006, Z4 (E85) 2002–2008
DME: Fuel injector cyl. 4
Module version: Motor Electronics (MSS54DS0)
In: 3 Series (E46) 1998–2006
Reading and clearing it
Fault code 0021 is a BMW code, stored in the car's engine electronics, 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 engine electronics is on: 8 Series (E31), 5 Series (E34), 3 Series (E36), Z3 (E36/7), 7 Series (E38), 5 Series (E39), 3 Series (E46), Z8 (E52), X5 (E53), X3 (E83), Z4 (E85), Z4 (E86)
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