I got a new 02 sensor, didn't touch the end of it or anything like that, yet when I take my car to get it ref'd it still throws a code 1. Even though when I turn the car on it wont be on, it came on when they were towards the end of their test. I think the ref said something about at the high idle test or some shit. Any help appreciated. Was looking at my car. There is no CEL but it throws a code 1.