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Auxiliary Battery c300

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Old 07-23-2017, 09:23 PM
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C300 4matic
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Can anyone confirm if a 2015 c300 4matic have a auxiliary battery and if so its location and how to replace it
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Old 07-24-2017, 10:33 AM
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1999 E300TD
If you want a correct answer, then post your VIN!
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Old 07-24-2017, 10:40 AM
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bone stock E55 AMG
moved to W205 forum...
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Old 07-24-2017, 11:08 AM
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C300 4matic
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55swf4kbofu006579
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Old 07-24-2017, 04:20 PM
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1999 E300TD
Originally Posted by 490822MS
55swf4kbofu006579

I could not find any evidence of an aux battery in that VIN!
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Old 07-24-2017, 04:26 PM
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2016 GLC300 Dakota Brown on Espresso Brown Leather, 2014 C250 Sport Diamond Silver
There is no aux battery on the w205 c300
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Old 07-24-2017, 09:18 PM
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C300 4matic
I had a message pop up which read Auxillary Battery Malfunction since it was still under warranty I took it to the dealership and they fixed it and said replaced the Auxillary battery ? I have attached pictures of the work they did and asked the Service Manager where the battery was located and he said it was in the trunk - I did not see anything there ?? So maybe someone can confirm exactly what is going on
Attached Thumbnails Auxiliary Battery c300-img_4922-002-.jpg   Auxiliary Battery c300-img_4934.jpg  
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Old 07-24-2017, 09:44 PM
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2016 GLC300 Dakota Brown on Espresso Brown Leather, 2014 C250 Sport Diamond Silver
Originally Posted by 490822MS
I had a message pop up which read Auxillary Battery Malfunction since it was still under warranty I took it to the dealership and they fixed it and said replaced the Auxillary battery ? I have attached pictures of the work they did and asked the Service Manager where the battery was located and he said it was in the trunk - I did not see anything there ?? So maybe someone can confirm exactly what is going on
They replaced a capacitor/converter. It is not an actual battery. There is no battery in the trunk. This part is located in the passenger footwell under the carpet. Take a look at your invoice.
Last edited by dieseldoc; 07-24-2017 at 09:47 PM.
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Old 07-25-2017, 04:50 PM
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2017 C43 sedan
They told me mine was in my left rear tire.. they said it was in the tpms sensor..
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Old 10-05-2017, 11:01 AM
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Originally Posted by 490822MS
I had a message pop up which read Auxillary Battery Malfunction since it was still under warranty I took it to the dealership and they fixed it and said replaced the Auxillary battery ? I have attached pictures of the work they did and asked the Service Manager where the battery was located and he said it was in the trunk - I did not see anything there ?? So maybe someone can confirm exactly what is going on
I found it with my car it's under the passenger front foot parpet, but I'm not sure whether I can fix witout clear the error message by computer. I will try to buy a new convertor to fix it.
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Old 03-05-2019, 02:22 PM
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2015 C300 4Matic
Smile How to remove the carpet
Originally Posted by giowoo
I found it with my car it's under the passenger front foot parpet, but I'm not sure whether I can fix witout clear the error message by computer. I will try to buy a new convertor to fix it.
Do you know how to remove the carpet? Since it is fitted so well.
Thanks.
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