But, but, but????? There is an O2 sensor in the left exhaust pipe about 6 inches downstream of the manifold.... the wire is routed along the firewall and terminates under the fuse box... goes to nothing... (has been cut). If there is no control unit, why is there an O2 sensor? Did someone install american exhaust? I sure wish I could find some manuals for this euro car. This is my first MB and I love it, but it is tough to work on without wiring diagrams!!! Anyone have any more info for me???