O2 sensors can go bad. It's cheaper and easier to replace that and see if the problems go away than going too much further down the rabbit hole.
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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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