BMW fault code 0004
Engine electronics
In the engine electronics, code 0004 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 4
Module versions: Motor Electronics (BMS43DS0), Motor Electronics (DM338DS0), Motor Electronics (DM338DS1)
In: 3 Series (E36) 1990–2000, 3 Series (E46) 1998–2006, 7 Series (E38) 1994–2001
Oxygen sensor heating behind catalytic converter Bank 2
Module versions: Motor Electronics (DM5212R5), Motor Electronics (DM5212R6), Motor Electronics (DM528DS3)
In: 5 Series (E39) 1995–2003, 7 Series (E38) 1994–2001, X5 (E53) 1999–2006
Oxygen sensor heating Bank 2 before catalytic converter OBDII error !!
Module versions: Motor Electronics (DM524DS0), Motor Electronics (DM528DS0)
In: 3 Series (E36) 1990–2000, 5 Series (E39) 1995–2003, 7 Series (E38) 1994–2001, X5 (E53) 1999–2006
DME: Oxygen-sensor heater after cat. conv., bank 2
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 3
Module version: Motor Electronics (BMSS501)
In: 3 Series (E36) 1990–2000
DME: Fuel injector cyl. 3
Module version: Motor Electronics (MSS54DS0)
In: 3 Series (E46) 1998–2006
Reading and clearing it
Fault code 0004 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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