BMW fault code 4B42
Engine electronics
In the engine electronics, code 4B42 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.
4B42 Electric fan 3 (nv)
Module versions: Digital Diesel Electronics (D50M47A), Digital Diesel Electronics (D50M57A0), Digital Diesel Electronics (D50M57A1), Digital Diesel Electronics (D50M57C0), Digital Diesel Electronics (D50M57D0), Digital Diesel Electronics (D50M57E0), Diesel electronics master (D51MM670), Digital Diesel Electronics (D60M47A0), Digital Diesel Electronics (D60M57A0), Digital Diesel Electronics (D60M57D0), Digital Diesel Electronics (D62M57A0), Digital Diesel Electronics (D62M57B0), Diesel electronics master (D63MM670)
In: 3 Series (E46) 1998–2006, X5 (E53) 1999–2006
4B42 Electric fan
Module versions: Digital Diesel Electronics (D70N47A0), DDE (d70n47b0) (D70N47B0), Digital Diesel Electronics (D71N47A0), Digital Diesel Electronics (D71N47B0), Digital Diesel Electronics (D71N47C0), DDE (d71n47d0) (D71N47D0), Digital Diesel Electronics (D72N47B0), Digital Diesel Electronics (D73N47A0), DDE (d73n57b0) (D73N57B0), Digital Diesel Electronics (D73N57D0)
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.
DDE: Electric fan 3 (-)
Module versions: Digital Diesel Electronics (D50M47B1), Digital Diesel Electronics (D50M57B1), Digital Diesel Electronics (D50M57E1)
In: 3 Series (E46) 1998–2006, X3 (E83) 2003–2010, X5 (E53) 1999–2006
DDE: Electric fan
Module version: DDE US-diesel fuel (D73N57C0)
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 4B42 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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