BMW 1-Series Forum (F20) 135i - 1Addicts.com > Second Generation 1 Series Forum > 2012 BMW 1-Series Sporthatch (F20) Discussion > F20 B48 engine strange humming intermitent sound when idle
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      05-29-2019, 01:39 PM   #1
tearus
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F20 B48 engine strange humming intermitent sound when idle

Hello, I have a 120i (f20) which is making a strange sound when idle, I took it to the official service but they don't know what it might be. Any ideas? Thanks
Here is the video:

https://streamable.com/7z4ms
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      05-30-2019, 02:14 PM   #2
tearus
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Someone also mentioned it here: https://f30.bimmerpost.com/forums/sh....php?t=1566730 but there is no concrete answer
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      04-17-2020, 12:24 PM   #3
Przemek23111
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Hi,
Do you know what is it?
I have the same problem.
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