bacherz

Replaced b1 s1 and b1 s2 o2 sensors after failing emisions both had too high of resistance. after replacement of both sensors i failed again and the codes came back as P113 too high heater resitance b1 s1 and P0140 sensor curcuit no activity detected. car runs and idles well at about 20mpg... did some research and came up with nothing to do with these circumstances. i checked the heater circuit which is under 20 ohlms. also heard one failing could fool ecm or ecu into thinking both failed??? car has 117,000...audi s4 b5