BMW fault code 657E
Parking brake
Parking brake internal control unit fault (reference voltage invalid)
Module version: Parking brake (EMF_89)
In: Z4 (E89) 2009–2016
Reading and clearing it
Fault code 657E is a BMW code, stored in the car's parking brake, 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 parking brake is on: 7 Series (E65), 7 Series (E66), 7 Series (E67), X5 (E70), X6 (E71), X6 (E72), X1 (E84), Z4 (E89), 3 Series (E90), 3 Series (E91), 3 Series (E92), 3 Series (E93)
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