BMW fault code 0025
Engine electronics
In the engine electronics, code 0025 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.
Oxygen sensor heater relay
Module versions: Motor Electronics (BMSS501), Motor Electronics (DM338DS1)
In: 3 Series (E36) 1990–2000, 7 Series (E38) 1994–2001
DDE: Pedal-travel sensor
Module versions: Digital Diesel Electronics (DDE22DS0), Digital Diesel Electronics (DDE30DS0)
Which BMWs have these versions depends on the engine and equipment, so we don't list them here; AutoLingo for BMW reads which version your car has.
Oxygen sensor heating
Module version: Motor Electronics (BMS43DS0)
In: 3 Series (E36) 1990–2000, 3 Series (E46) 1998–2006
Oxygen sensor heating relay
Module version: Motor Electronics (DM338DS0)
In: 7 Series (E38) 1994–2001
DME: Main relay: switching delay
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: Oxygen-sensor heater before cat. conv., cyl. 1-3
Module version: Motor Electronics (MSS54DS0)
In: 3 Series (E46) 1998–2006
Reading and clearing it
Fault code 0025 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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