Happened to my father's 335d. They replaced the pulleys, tensioner, and belt. It's an obnoxious noise.
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'17 M3 Imola Red/Carbonstructure Cloth, Competition, Lighting, 6MT
Retired: '93 325i |'99 Jeep Wrangler Sport |'06 330i Sport |'08 335i Sport |'08 328i Sport |'09 335d Sport
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