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    W166 2012 ML350 Bluetec - Error Code P20B9 Help please?

    Hello I have a 2012 ML350 Bluetec (w166) vehicle that has covered about 40k miles. The engine management light came on last week. The vehicle is now just out of warranty. I plugged OBD-II code reader in and found I have code P20B9 . Can anyone shed light on what this might be? the vehicle...

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