03-29-2007, 05:32 PM
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Registered User
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Join Date: Feb 2003
Location: Ontario, Canada
Posts: 3,160
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Here are the codes:
http://www.buellwinkle.com/MBOBD2.html
I would start by checking, to see if there is 12 volts supplied to the O2 sensor Heater circuit.
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2007 C 230 Sport. 
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