Engine starts easy and runs slightly unevenly. At idle there is white smoke emitted from the exhaust. When I increase the RPM the white smoke increases. At 2000 RPM there is a lot of smoke. Car drives but I do not want to drive it far with this fault. I suspected the O2 sensor but I can't find it - can someone tell where it is on this D3EA engine. I did check the O2 sensor wiring to the ECM and found wires in the ECM connector as per the wiring diagram.