BMW fault code 9577
A-pillar satellite
SASL: Control-module fault (error acceleration sensor self-test value too large y-direction)
Module version: A-pillar satellite (SASL)
In: 7 Series (E65) 2001–2008, 7 Series (E66) 2002–2008, 7 Series (E67) 2002–2008
Reading and clearing it
Fault code 9577 is a BMW code, stored in the car's a-pillar satellite, 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 a-pillar satellite is on: 7 Series (E65), 7 Series (E66), 7 Series (E67)
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