Step one is always to scan for codes in the ecu. I wouldn't touch anything until that is done or you could create new problems in the process.
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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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