BMW fault code 003F
Electronic immobilizer
EWS: Internal control-module fault (illegal-Opcode-Trap)
Module versions: Electronic immobilizer 3 (EWS3), Electronic immobilizer 3D (EWS3D)
In: 3 Series (E36) 1990–2000, 3 Series (E46) 1998–2006, 5 Series (E39) 1995–2003, 7 Series (E38) 1995–2001, X3 (E83) 2003–2010, X5 (E53) 1999–2006, Z4 (E85) 2002–2008, Z4 (E86) 2006–2008, Z8 (E52) 2000–2003
Reading and clearing it
Fault code 003F is a BMW code, stored in the car's electronic immobilizer, 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 electronic immobilizer 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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