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 off. The car was originally delivered in the US (Boston) and shipped to Europe in 1995. I'm looking for experience with such a car and want to find out what impact this setup can have on the optimalisation of the fuel mixture.