Okay guys, running into a problem and I can't seem to figure it out. I have 1 o2 sensor on the Aristo manifold. On the ECU side, I have B2S1 taped into B1S1. Now, When i drive the car, the ONLY CEL's that come up are Heater's for all 4 o2 sensors? I would imagine, the signal would come up for both rear sensors since they are not even present. But I'm not worried about that. Is there any reason, the heater code would be present but not the signal code? Could this just be an indication of a bad sensor?