I could not reset my cabin filter service and brake warning once, due to custom coding in my Kombi ECU. I reset it back to default (SG_Coderein) and I was able to reset both service warnings. Then I recoded the features I wanted back into my Kombi. This was after replacing brake wear sensors too. Tripped me out. All I coded was digital speed display, true speed and the new DSC icon. But that prevented my service resets. This was on my 07 335i coupe.
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