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Well I got the same thing happening to me last winter in the bitter cold and BMW told me that it was the DEF Sensor and they had to replace the tank as the sensor is part of the tank. So they did and everything was fine mind you we didn't have an other cold snap last winter but this past week the temperature dropped to -35 degree Celsius and on my way home from work bam the check engine light went on. I didn't have a change to take it to BMW yet but like last year they told that it was ok and the light would go off and it did today 4 days after it first came on. I think we have to be a little carful as to what quality of diesel we are putting in our car, specially in the winter. I just fill up with Shell Premium Diesel the day before the light went off so I presume that maybe the Ultramar Diesel is not as good as the Shell. I will go to the dealer so that they can read the code but I will keep putting Shell Premium Diesel for the rest of the winter and see if I get more error.
Francis
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