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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Powertrain and Drivetrain Discussions > N57 / M57 Turbo Diesel Discussions - 335d > Whining sounds from alternator or power steering



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      12-02-2016, 06:06 PM   #1
tvran23
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Whining sounds from alternator or power steering

My 2011 335D has developed a whining type sound that appears to be coming from the alternator. I have read some stuff that the PS could also be a source. It does seem to make more noise at low speed when i turn the wheel. If either, is this something that is covered under CPO? Thank you.
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      12-02-2016, 08:24 PM   #2
BB_cuda
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Use automotive stethoscope on both to narrow it down. Check fluid level in PS reservoir. Pumps typically whine if low on fluid.
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      12-03-2016, 05:30 PM   #3
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The PS reservoir was almost empty and noticed fluid leak drops now under the car. Not sure if pump or a hose. Hopefully covered under my CPO. Thanks.
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      12-03-2016, 08:31 PM   #4
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Good luck with the repair.
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