C-Class (W203) 2001-2007, C160, C180, C200, C220, C230, C240, C270, C280, C300, C320, C230K, C350, Coupe

Found this plug in the engine bay, help me Identify it ?

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Old Aug 6, 2013 | 05:34 PM
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W203 C200K (2001)
Found this plug in the engine bay, help me Identify it ?

Hey guys, I found this plug in my engine bay, it's close to the battery and runs behind the engine, anyone know what it could be ?
I bought the car with a missing cabin filter box though, already ordered it and it's on the way, does the cabin filter have any plugs ?

here's are some pics

Found this plug in the engine bay, help me Identify it ?-whatsthis.jpg
Found this plug in the engine bay, help me Identify it ?-whatsthis2.jpg
Found this plug in the engine bay, help me Identify it ?-whatsthis3.jpg


thanks
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Old Aug 8, 2013 | 03:17 PM
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Do hear a chirp when locking and unlocking the car? Look along the inward side of the strut tower. There is a hole in the sheet metal for a connector. Outside the engine compartment but inside the wheel arch cover there is a siren that makes the chirps. It also wails when the panic button is pressed on the key.
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Old Aug 8, 2013 | 03:21 PM
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I don't hear chirps no, and yes there's a plug in the strut. But there's a cable already plugged there, it's too short to reach the strut anyways. I thought that the cable in the strut was for the Break pad sensor or ABS sensor ??
I also don't have a panic button.
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Old Aug 9, 2013 | 01:35 PM
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That plug goes to your multi-function sensor for your air conditioning. You must have the control unit with the digital display. Looking at your last pic, I think can see a corner of your multi-function sensor sticking out. It should plug in there. I circled it in the pic.
Attached Thumbnails Found this plug in the engine bay, help me Identify it ?-8-9-2013-12-32-12-pm.jpg  
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Old Aug 9, 2013 | 01:38 PM
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W203 C200K (2001)
Originally Posted by jrsmith_68
That plug goes to your multi-function sensor for your air conditioning. You must have the control unit with the digital display. Looking at your last pic, I think can see a corner of your multi-function sensor sticking out. It should plug in there. I circled it in the pic.
Thanks a lot for the tip, I'll give it a look tonight and will post back results !
but no, I don't have the digital one, this is how mine looks like (Not mine, stole picture from another thread)

Found this plug in the engine bay, help me Identify it ?-thermatic-climate-control-panel-003.jpg
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Old Aug 9, 2013 | 04:08 PM
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Hmmm, a mystery, I'd like to see a better photo of what I think is peeking out under your water shield. Let us know what you find tonight.
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Old Aug 9, 2013 | 06:33 PM
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W203 C200K (2001)
Mystery Indeed, I was just looking at it and no, the part you saw sticking out was just the windshield plastic trim, fortunately i had an older picture lying around so i marked what you where seeing

Found this plug in the engine bay, help me Identify it ?-img_0265.jpg

from the length of the wire, it can only reach

1-The battery (does the OEM battery has any plugs ??)
2-The cabin filter box (I don't have it installed, part is coming soon though)
3-The strut, but there's already a plug in there..

I'm pretty confused and have no idea what could it be, my engine is giving some error codes though, the previous owner probably had a stupid mechanic, Right now at the time of speaking the codes i'm getting are:

P0101 (MAF "A")
P0340 (Camshaft pos. sensor "A")
P0141 (O2 sens. heater circuit)

It can't be the MAF or the camshaft sensor, because their plugs look different, so my final guess is maybe it's the O2 heater thingy ? I'll have to remove the engine cover and take a look so I might find out what this is !

Any thoughts ?
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Old Aug 9, 2013 | 07:08 PM
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Last edited by mb techman; Sep 23, 2014 at 06:34 PM.
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Old Aug 10, 2013 | 06:36 AM
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W203 C200K (2001)
Ahhh ok that makes sense now, so I'll just tuck it somewhere then.

Yeah I know it's not the. O2, but I was talking about te "O2 Heater circuit", any ideas about that ?
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Old Aug 10, 2013 | 07:37 AM
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Last edited by mb techman; Sep 23, 2014 at 06:34 PM.
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Old Aug 10, 2013 | 07:41 AM
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W203 C200K (2001)
Originally Posted by mb techman
its all part of the o2 sensor harness. most likely your o2 will require replacement
I see, that's a good head start for me, I was going to start looking for the heater circuit, so I'll probably buy a new sensor since I don't believe in cleaning o2 sensors anyway, thanks a lot
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