SL-Class (R231) 2013 on: Discussion on the SL550

SL/R231: Strange noise from left rear area on my 2013 SL550 with ABC

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Old 03-17-2020, 08:52 PM
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Strange noise from left rear area on my 2013 SL550 with ABC

Got some intermittent high pitch noise coming from behind the driver seat area. Wonder what could it be? I did managed to remove the cover panel and the noise became more noticeable. .
Old 03-18-2020, 12:48 AM
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Is that noise there standing or driving or both?
Old 03-18-2020, 03:02 AM
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Originally Posted by Wolfman
Is that noise there standing or driving or both?
Noise only noticable when the car is fully warmed in especially sport mode over the comfort mode.
Old 03-18-2020, 03:04 AM
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Vehicle in motion only...
Old 11-22-2022, 02:35 PM
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Did you work out what this was? My 2013 R231 is doing the exact same.
Old 05-13-2024, 04:49 PM
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Update: I had the return valve replaced in my front ABC valve block and this has cured the honking noise once the ABC oil is warm.

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