Yeah, they are calibrated from the factory and cant be changed. Its definately the sensor though, did a test I saw on youtube. Soak a rag in brake clean and lay the sensor in it. It goes to full rich and a good sensor should stay there. Bad sensors, like mine, will sit at full rich and then go to full lean while they are still in fuel. Then when you take them out, as the fuel dries off the sensor it goes from full lean, back to full rich, and slowly to lean again. Probably just going to get a new one from Ebay