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Old 11-06-2015, 07:56 PM   #11
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Join Date: Feb 2012
Posts: 19
There is a sensor in your def tank that activates when fluid is at freezing. I had a check engine light come on while traveling cross country this past summer. Stopped at MB dealership in Knoxville and was told it was the sensor and I would be okay to drive it home which is CA, but avoid driving where the temperature is below 32. I was told it is a common problem and my 2012 solera is covered under warranty. I just had it replaced a couple weeks ago at no charge and the dealership gave me a loaner car for the day, a 2016 c-class which was awesome. I was told that warranty on emissions 8 yr/100k or there about. Just wanted to share the story and the relief of not having to pay.

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Old 11-06-2015, 08:04 PM   #12
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Join Date: Sep 2012
Location: Tiverton, RI
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DEF freezes about 15 degrees. There should be a DEF warmer. EPA mandates the def should be flowing within 70 minutes of startup. I personally would have filled itbin the spring. Sent tipsy from mobile....

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