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2009 ML320 Bluetec, 150,000 miles. Codes P2457, P2202, P203D, P205D. Reset and only code P2457 returned after about 120 miles of highway driving and 5-10 miles in-town driving. Other: using a small amount of oil -- about 1 quart in 7000 miles. Need help diagnosing.
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From what I have located on this here this code can set when there is an issue with the diesel particulate filter itself or a pressure sensor in the exhaust system.In most cases this is the filter itself needing cleaned or replaced to correct this fault here.You will have to have this tested further to be sure of the cause and from there repaired/replaced to correct this fault.
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