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Shout out to AMGtech - now with more recalls- - my unused Mercedes CPO warranty extension is about to pay for itself...

AMGtech has been banging the drum lately about M278 issues, and even gave me tips on how and where to look. I pulled one cam position sensor on the driver’s side, and it was dry. Then, a cam adjuster magnet on the same side - it seemed a little damp. Next was the top cam position sensor on the passenger side, which is this:

Overlubricated cam position sensor - top pax side, M278
Overlubricated cam position sensor - top pax side, M278
Photo: Mercedes Benz Kwality
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It should not be shiny, and my fingers shouldn’t be covered in oil from pulling it...

Now to call the dealer and get a loaner. Wish me luck peeps - this can range from new sensors, to a new engine harness, to a new engine. Or all of the above.

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Yay warranty!!!

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