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After a long search on what's causing fuel smells in the exhaust and the engine not running smoothly on operating temp, I decided to replace my oxygen sensor. To my big surprise, only the connector (see picture) is installed. The hole where the wires to the sensor are supposed to be is sealed...

After a long search, I found this article (http://www.mbclub.co.uk/forums/engine/96013-three-years-rough-idle-sl320-r129-v6-m112.html) which describes the symptoms of my car: - vibrating at idle when engine is warm - fuel smell in exhaust - some loss of power at low refs (not sure of this...