BMW fault code 0090
Panorama glass sunroof
SHD: A090 Roof unit, slide/tilt sunroof
Module version: Panorama glass sunroof (SD_DS2)
In: 3 Series (E46) 2001–2006, X3 (E83) 2003–2010, X5 (E53) 1999–2006
Reading and clearing it
Fault code 0090 is a BMW code, stored in the car's panorama glass sunroof, 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 panorama glass sunroof is on: 7 Series (E38), 3 Series (E46), X5 (E53), X3 (E83)
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