SOURCE: How to reset a 2012 ML350 A3 service warning
you need to use the diagnostic program too do this step after a full service
ie check and replace brake pads and fuel filters paper filter oil and fluids and filters then reset its ecu
try to ask the local garages who has the right cable and tools and ask them to either do the full service and reset it
or reset it if youve done a service
this only comes on at a major service point or if the ecu detects an issue so is not just a short service
anything from worn pads to bad oil presure can cause this too trigger as well as miles count
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