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Dust collecting inside LED headlights

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Old Oct 5, 2025 | 04:20 AM
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Patrck C's Avatar
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2013 C300, 2023 C300
Dust collecting inside LED headlights

Wondering if anyone else have "problem" with dust entering supposedly sealed LED headlight? Just noticed that there are quite a lot of dust inside/behind my headlight lens on my 2023 C300, with digital light.
I am very sure they are behind the lens and inside the light and not suface defects refraction. Noticed while replacing my headlight ppfs, they are original lights never repaired or anything. There are also dust on the "bulbs" and on black/shiny trims.
Interstingly we have another 2023 c300 in the family with identical milleage(13k miles), that has regular LED lights(non digital), it also have some dust behind its lens, but just a few speckle, while the digital light one has lots, almost "a layer" at this point.
Both cars does not get parked outside but shouldn't matter? It has only been two years, and afaik, there is no way to clean it besides removing the lens cover.

Is this normal? Anyone else have this? you may need a flashlight or under the sunlights to see them.
Never had this in any other of my car with sealed LED lights and this is my first MB with "advanced" headlights.


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Old Oct 6, 2025 | 06:57 AM
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818benz's Avatar
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From: SFV
2025 C300
Originally Posted by Patrck C
Wondering if anyone else have "problem" with dust entering supposedly sealed LED headlight? Just noticed that there are quite a lot of dust inside/behind my headlight lens on my 2023 C300, with digital light.
I am very sure they are behind the lens and inside the light and not suface defects refraction. Noticed while replacing my headlight ppfs, they are original lights never repaired or anything. There are also dust on the "bulbs" and on black/shiny trims.
Interstingly we have another 2023 c300 in the family with identical milleage(13k miles), that has regular LED lights(non digital), it also have some dust behind its lens, but just a few speckle, while the digital light one has lots, almost "a layer" at this point.
Both cars does not get parked outside but shouldn't matter? It has only been two years, and afaik, there is no way to clean it besides removing the lens cover.

Is this normal? Anyone else have this? you may need a flashlight or under the sunlights to see them.
Never had this in any other of my car with sealed LED lights and this is my first MB with "advanced" headlights.


Are you sure the dust is inside the lens? It may be road debris that needs to be polished off.

If there is indeed dust intrusion, you should have the headlights replaced. They're meant to be completely sealed so this is a major failure and is covered under warranty. They cannot be repaired and the entire unit must be replaced due to how the headlights are sealed from the factory.
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