BMW fault code 278A
Engine electronics
In the engine electronics, code 278A 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.
DME: Fuel mixture adaptation, idling, per time unit
Module versions: Engine electronics (ME17N45), Engine electronics (MEV17_2), Engine electronics (MEV17_2N), Engine electronics (MEV17N46)
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.
DME: Catalytic-converter conversion, bank 2
Module versions: Engine electronics (MS_S65), Engine electronics (MS_S65_2), Engine electronics (MS_S65_3), Engine electronics (MSS60)
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.
DME: Ambient temperature
Module versions: Engine electronics (ME9E65_6), Engine electronics (ME9K_NG4), Engine electronics, cylinder bank 1 (N73_R0)
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.
DME, internal fault, hot film air mass meter: Line disconnection, standby switch
Module versions: Engine electronics (MEVD174K), Engine electronics (MEVD176K), Engine electronics (MVD1722)
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.
CDKTUM - Ambient temperature
Module versions: Engine electronics (ME9N62), Engine electronics (MEV9N46)
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.
Fuel mixture adaptation, idling, per time unit
Module version: Engine electronics (MV1722)
Which BMWs have this version depends on the engine and equipment, so we don't list them here; AutoLingo for BMW reads which version your car has.
Reading and clearing it
Fault code 278A 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: 3 Series (E46), Z8 (E52), X5 (E53), 5 Series (E60), 5 Series (E61), 6 Series (E63), 6 Series (E64), 7 Series (E65), 7 Series (E66), 7 Series (E67), X5 (E70), X6 (E71), X6 (E72), 1 Series (E81), 1 Series (E82), X3 (E83), X1 (E84), Z4 (E85), Z4 (E86), 1 Series (E87), 1 Series (E88), Z4 (E89), 3 Series (E90), 3 Series (E91), 3 Series (E92), 3 Series (E93)
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