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w203 2005 201C truble code problem
Mercedes Benz 
c w203 2005 1.8 kompresor
201c selfadaptation of mixture formation; The mixture is too rich in the part load range.

o2 sensor stay 1.4v,
i have replaced o2 sensor and nothing changed, no vacum leak, no exchause leak, MAF ok, car run perfect

can someone give me e direction or solution please?
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