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      09-17-2012, 02:57 PM   #2
F80_M3llow
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Drives: 2011 335i
Join Date: Apr 2008
Location: Norwalk CT

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2016 BMW M3  [9.00]
2008 135i  [7.00]
Yes there is only one serpentine belt that drives all the pulleys. I have a n52 diy if you check on my posts. The idle pulley should be checked. I spin it and if it spins freely and sounds like there is sand grinding in there then replace. I I would do everything in one shot.
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