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Yeah... lame advice, but until you know what is causing the CEL, you have no idea what problem(s) you have!
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MBs have very specific codes that require very specific tools. You can spend anywhere from around a hundred to a few thousand. There are many threads here on the merits of the many choices.
Plutoe here will always give you his five cents plus some!
The Best of Mercedes & AMG

http://www.aliexpress.com/item/Hot-S...246619660.html
The other option out there is to get a Star Diagnostic/DAS/Xentry system which can range from $400-$600+.
http://www.aliexpress.com/item/Hot-S...246619660.html
The other option out there is to get a Star Diagnostic/DAS/Xentry system which can range from $400-$600+.
I have a couple scanners. I use my Actron CP9580A first because it's simpler, but if I need to dig into the MB sensor diags, the Launch X431 is excellent, and by far the best value when compared to the cost of an Autel or the unquestionably incomparable SDS X-Entry which is the factory standard.







