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S-Class (W222) 2014-2020

FCP Euro: How to Keep Oil From Damaging Your Mercedes' Wiring Harness

Old Jan 20, 2023 | 08:27 PM
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Exclamation FCP Euro: How to Keep Oil From Damaging Your Mercedes' Wiring Harness

Just FYI. Good Info for 2012-2017 S550 and other models.
-Bart
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Old Jan 20, 2023 | 09:08 PM
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Originally Posted by Bart-N3GQ
Just FYI. Good Info for 2012-2017 S550 and other models.
https://www.youtube.com/watch?v=1A3pZ34UAqA
-Bart
Looks informative thanks for sharing.
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Old Jan 20, 2023 | 09:37 PM
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2016 S550
I literally took my 2016 S550 into the dealer yesterday to look at a cracked antifreeze reservoir as well as some codes i had been getting for the cats and they found this...

wiring harness soaked in oil, engine control unit needs replacement. i am still under CPO but if you are not please consider doing this...
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Old Jan 20, 2023 | 11:37 PM
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Since this problem is apparently somewhat common, does anyone know why, other than cost, MBZ doesn't install these "sacrificial pigtails" as a routine service campaign? Their problem; their solution.
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Old Jan 21, 2023 | 12:04 AM
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Thanks for this! I ordered 8 to take every precaution.
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Old Jan 21, 2023 | 04:12 AM
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Thank you for this!
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Old Jan 21, 2023 | 01:56 PM
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Why is there not just one or more drain holes in the wiring harness to prevent oil from getting to the costly parts ??
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Old Jan 21, 2023 | 04:10 PM
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Originally Posted by as.thompson
Since this problem is apparently somewhat common, does anyone know why, other than cost, MBZ doesn't install these "sacrificial pigtails" as a routine service campaign? Their problem; their solution.
Good question. I agree, it should be!
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Old Jan 21, 2023 | 04:46 PM
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My CPO warranty ends in April, does anybody know if this effects the V6 motor that is in the 550e?
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Old Jan 22, 2023 | 12:41 AM
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Well this is news, I thought this ended with the 272/273, I had a 276 to 125k without any sign of this so surprised to hear its back
​​​​​​
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Old Jan 22, 2023 | 04:11 PM
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Is the 18 and up affected by this also>?
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Old Feb 5, 2023 | 10:17 PM
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Seems like a simple fix but would love to see a video for the m176 engine
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Old Feb 9, 2023 | 12:51 PM
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Good info, thanks. I checked fcp and their kit is $211, not bad.

Last edited by Rmayrap; Feb 9, 2023 at 12:58 PM.
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