Can only scan vehicle through eobd comes up with bank2 lean after a smoke test no leaks found so i scoped o2 sensors. found one 02 sensor to be 3.8v flat line on scope which didnt change as i reved engine. The sensor has no feed so i checked the fuse which is o.k. the fuse does both pre and post cat sensors so for testing purposes put a tempary wire in as the feed wire(from fuse) but still no switching of sensor so replaced sensor just incase sensor was faulty still no joy (not surprised) the heater circuit is also not working even with temp feed wire. what should i test or look for next i can upload any waveforms or tests.

thanks in advance
carl