BMW 135i & 335i - Serpentine Belt Issues with Fix! (N54)

Having problems with your serpentine belt on your N54? I was too, until I finally figured out the cause. Check out a few of the most common culprits.

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BMW 135i & 335i - Serpentine Belt Issues with Fix! (N54)

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BMW 135i & 335i - Serpentine Belt Issues with Fix! (N54)