Streaks on front side windows
BMW technical service bulletin B510621 for 2021 BMW 430I, 2021 BMW M4 and 2021 BMW M440I.
- Bulletin number
- B510621
- Component
- Visibility: power window devices and controls
- Summary
- STREAKS ON FRONT SIDE WINDOWS: Streak marks are visible, most commonly on the upper rear corner of the front side window. The marks can be present anywhere on the rearmost edge of either front window.
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