Update Needed for Rough-Running BMW
This bulletin applies to 2018 BMW 2 Series, 3 Series, 4 Series, 5 Series, 6 Series and 7 Series vehicles. The vehicle may run rough when accelerating from a standing position and DTC FC 21A02D (combustion control: valve lift correction when at idle) may be stored in the DME (digital motor electronics) fault memory.
A software error in the DME is likely the cause. BMW recommends updating the software using ISTA 4.27.10 or higher. Do not replace any parts if DTC FC 21A02D is the only fault found.