I dont have Star but a google of OM642 + each code above will get you on the right path. The same motor is used on a number of MB, Jeep, and Sprinter vehicles.

Highly recommend you invest in a mid-range scanner if you will be keeping the car long term. I spent ~$150 on the Foxwell NT510 Elite for my 09 W211 Bluetec and have been happy with it. Hopefully the SnapOn was able to read all the various MB modules. The Foxwell can, and it is very useful vs the more basic code readers.

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2009 E320 Bluetec - 242k miles and a work in progress!