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2005 Mercedes-Benz ML350 Question: instrument cluster display

 

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Lisa G, Tustin, CA, February 05, 2011, 21:04
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On my instrument cluster in the mileage display it shows a wrench, the letter D, the number 4, and a minus sign. I know the one wrench means minor tune up but what does the number 4 and the minus sign mean?

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