Did you use a basic OBD scanner or one that can pull MB specific codes?

My ML was returning P1400 (or 1402, cant remember which exactly), but the generic OBD code said EGR valve while an MB SDS pointed me at the DPF pressure sensor.

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-Justin

91 560 SEC AMG - other dogs dd
01 Honda S2000 - dogs dd
07 MB ML320 CDI - dd
16 Lexus IS250 - wifes dd

it's automatic.