Yeah, but does it damage the o2 sensor and if so how?
A fault code indicates an out of spec condition, eg too lean like you say. Running 10 percent ethanol would require a 3 or 4 percent richer mixture, well within the ecu capabilities, so I don't see how there's such a big problem. I don't doubt you have seen it. But I just winder if it really is the e10 doing it
So are you saying that a commodore that can run e85 will kill o2 sensors in 6 months? I find that hard to believe.