That's because P0300 is kind of a catch-all code. It could be almost anything, or even nothing at all. Try cleaning the MAFs. It may work. Otherwise, there's a lot of threads here about the many possible culprits. I just had my tuner turn that one off. There's misfire codes for each cylinder, so we didn't really need the random code as an option for the ecu.
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2011 MB Touring-Sport-6sp-Nav/GTM TT/FI TT TDX/JTran/Kosmic/Eibach/Hotchkis/SPC/CSF/RPS/SoThatsWhereAllMyMoneyWent
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