Hi, my 35d has code 4949 Glow system configuration and code 4A5E Glow plug cylinder 2 activation. So I decided to follow someone's idea, to swap the glow plugs. After taking out manifold and swapped glow plug 2 and 3. It's now showing code 4A4E, Glow plug cylinder 3. So its indeed the Glow plug issue. But code 4949 Glow system configuration. The BMW name, marks, M stripe logo, and Roundel logo as well as X3, X5 and X6 designations used in the pages of this Web Site are the property of BMW AG X3 35i on Hwy; Bmw X3 Chrome Kidney Grilles Bmw f30 fault codes In a new video, BMW M GmbH presents the road to mastering the ultimate driving dynamics in the development phase for its new BMW.