BMW fault code 0001
Mirror memory, driver
Timer watchdog
Module version: Mirror memory, driver (SPM46FT)
In: 3 Series (E46) 1998–2006
Reading and clearing it
Fault code 0001 is a BMW code, stored in the car's mirror memory, driver, 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 mirror memory, driver is on: 3 Series (E46)
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