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Mercedes Benz
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2003
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C 230 CL (203.740) L4-1.8L SC (271.948)
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Repair and Diagnosis
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A L L Diagnostic Trouble Codes ( DTC )
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Testing and Inspection
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Manufacturer Code Charts
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Powertrain Management
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Code Tests
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204B
204B
Heating of Component G3/2 (O2 Sensor Upstream of TWC)
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Mercedes-Benz does not provide a guided test at this time.