How do I activate the ECO start/stop function?
To use the ECO start/stop feature, ensure your gear selector is in the D position. The system will then automatically switch off the engine at stops and restart it when your foot is taken off the brake (Page 145).
From the official Mercedes Benz Mercedes Benz C Class 2008 2014 Fuses And Fuse Box Diagram And Location manual, page 20
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