M-Class (W166) Produced 2012-2015

Oil in Harnesses-Fixed?

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Old Dec 12, 2025 | 10:04 PM
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2014 ML350 4MATIC
Oil in Harnesses-Fixed?

I’ve been reading about the oil in harness issue, and noticed my harnesses for camshaft solenoids and camshaft position sensors seem to have breaks in the outer jacket, near the connectors.
Did Mercedes already make changes in my 2014 ML350 to prevent this destructive phenomenon?
I don’t see how oil would get pumped through this type of harness, with the breaks in there….




Last edited by Brent S; Dec 12, 2025 at 10:07 PM.
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Old Dec 13, 2025 | 08:44 AM
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2013 ML550 US spec. Air+Offroad pkg
The oil actually gets in and travels via capillary action inside the wire between strands and the insulation, not the jacket. Pull connectors off and look inside those for oil.
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Old Dec 14, 2025 | 07:01 AM
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This is what you want. Ignore the engine reference. They work with all engines.

https://a.co/d/djSaqtC


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Old Dec 16, 2025 | 09:57 AM
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I was going to buy the camshaft solenoid part, and the online dealer parts sites claim that the part number “doesn’t fit” my 2014 ML350 ….?
276-156-07-90
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Old Dec 16, 2025 | 02:29 PM
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It is definitely still a thing even on later model years equipped with M276.
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Old Dec 17, 2025 | 08:56 AM
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Originally Posted by Brent S
I was going to buy the camshaft solenoid part, and the online dealer parts sites claim that the part number “doesn’t fit” my 2014 ML350 ….?
276-156-07-90
FCP Euro says it does fit. Gotta check more than one source.

https://www.fcpeuro.com/products/mer...0790kt#fitment

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Old Dec 17, 2025 | 05:03 PM
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W212 MY'14 M276-3.5NA @75kMi
oil in harness

Originally Posted by Brent S
I was going to buy the camshaft solenoid part, and the online dealer parts sites claim that the part number “doesn’t fit” my 2014 ML350 ….?
276-156-07-90
inspect actual parts for leaks...
Point being that solenoids are not primary leakers but Cam sensors are guaranteed to leak.

-- Short term remedy is new sensor + sacrificial extension.
-- Long term fix is prevent the extreme heat accumulation.
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