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s211 e320 cdi v6 boost leak, hissing sound

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Old Sep 24, 2025 | 10:34 AM
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mercedes 320 cdi s211
s211 e320 cdi v6 boost leak, hissing sound

hey i have a s211 e320 cdi 4matic 2007 (om642) and there is a boost leak but i dont know where i have changed all the gaskets and seals on the pressure side and changed the passenger side intercooler charge hose but nothing has worked it hisses alot when giving it throttle i have a check engine light on and limp mode when i go full throttle over 3k rpm at about 80-100kmh i have checked with multiple fault code readers and i get the p0299 and the p0088.
the sound is coming from the front pasenger side of the car and thats why i was almost certain it was the intercooler hose but apparently not and now im kinda lost i dont know what to do know and i have watched a couple of youtube videos were people with boost leaks but theirs does not hiss like mine and i mean its LOUD
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Old Sep 24, 2025 | 07:29 PM
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'17 GLS450, '14 GLK250, Grandpa's Roadster
Find someone who can perform a "smoke test" on it for you.
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Old Sep 28, 2025 | 12:26 PM
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1922 Ford Model T / no OBD
If you keep your engine clean, any boost leak will show as oily residue.
For smoke test, use CUBAN cigars only
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