A bad O2 would be it's own code, wouldn't it? P0300 seems to be a catch-all code for any time the ecu sees something weird.
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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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