E-Class (W212) 2010 - 2016: E 350, E 550

How do you disconnect this connector?

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Old 11-30-2018, 09:07 PM
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2012 S350 Bluetec, 2024 E350 4matic W214, 2014 GLK250 Bluetec, 2000 CLK320 Cabrio
How do you disconnect this connector?

It's obvious that I broke off the tab that was supposed to slide out (?). I don't want to force anything and am looking for some help with how to get this off. These little buggers are really difficult. Aside from this one, what's the trick in general? (No, I wasn't trying to yank it off with the pliers. I gently put those on there to try to pull up on it while I pushed in on the tab, but that doesn't seem to be working.)

Old 11-30-2018, 10:00 PM
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2003 CL 600
The tab under the locking tab you broke has to squeeze in, then pull it off. I find, often squeezing the lock tab and pushing it in slightly first helps it release, then pull it off.
Old 12-01-2018, 08:19 AM
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2012 S350 Bluetec, 2024 E350 4matic W214, 2014 GLK250 Bluetec, 2000 CLK320 Cabrio
Update - Well I was able to squeeze the tab and get it off, but apparently I broke it in a major way. The internal wires had come out of the housing, and when I tried pushing them back in, sheared off. Fortunately, my local dealer has a a2711500156 (Camshaft Magnet Wiring Harness) which is a separate piece, for $10. WHEW! I don't have to replace the whole wiring harness. But the good news is I do how to remove this type of connector now!


Old 12-01-2018, 03:08 PM
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all you need is this A0255456526. It is really easy to disconnect, just push down on the grey tab gently (if not damaged)
Old 12-01-2018, 04:43 PM
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1922 Ford Model T / no OBD
Looks like you had a piece missing from the beginning
It is pretty obvious that locking wedge is facing the camera and you have signs like screwdriver was used in the past to lift the tab over the wedge.
By pressing the side tabs, you unlock the cover from the main plug.
I hope new plug will make it all clear.
Old 12-02-2018, 06:07 AM
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Originally Posted by JohnnyC
all you need is this A0255456526. It is really easy to disconnect, just push down on the grey tab gently (if not damaged)
That's a good tip! I didn't know you could buy that separately. I would be concerned about getting the wires in there properly though since I don't have any specific electrical knowledge, i.e. pinning or soldering.

Originally Posted by kajtek1
Looks like you had a piece missing from the beginning
It is pretty obvious that locking wedge is facing the camera and you have signs like screwdriver was used in the past to lift the tab over the wedge.
By pressing the side tabs, you unlock the cover from the main plug.
I hope new plug will make it all clear.
That missing piece was all me. I am the guy haphazardly wielding the screwdriver LOL. I did come to a much greater understanding of how this all works though. We learn from our mistakes, right?
Old 12-02-2018, 10:42 AM
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1922 Ford Model T / no OBD
When I was replacing 642 engine, it had maze of sensors and plugs on them.
I recall at least 5 different types of locks on them. Good thing I keep my engine clean , so I was able to see the locking tabs and I actually like mechanical puzzles. The trickiest were where you had to pull the tabs up and then pull the plug. Each plug comes with good resistance from the seal, so you always wonder if that is tab, or seal holding.
Puzzles they are.
Old 12-03-2018, 07:40 AM
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2012 S350 Bluetec, 2024 E350 4matic W214, 2014 GLK250 Bluetec, 2000 CLK320 Cabrio
Originally Posted by kajtek1
When I was replacing 642 engine, it had maze of sensors and plugs on them.
I recall at least 5 different types of locks on them. Good thing I keep my engine clean , so I was able to see the locking tabs and I actually like mechanical puzzles. The trickiest were where you had to pull the tabs up and then pull the plug. Each plug comes with good resistance from the seal, so you always wonder if that is tab, or seal holding.
Puzzles they are.
Yes, and there appear to be a few different types of connectors on my wiring harness as well. For now, I've put everything back together and will revisit this job again later. No actual CEL yet and car is running fine.

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