I have a 2000 S10 basic 4 cylinder model. I had code that basically said I had an O2 sensor problem. I don't remember the exact code but it was a bank 2 switching issue. I ordered and replaced both O2 sensors. Since then I have driven the truck thousands of miles and have never gotten another code of any kind. Now it's time to register my truck and it's a smog year. I took it to get smoged and it won't pass and says O2 sensors not ready. I've disconnected the battery to reset the computer and have been driving it still no codes and still won't pass smog. Does anyone have some insight to this issue it's driving me nuts I'm now on a 60 day pass from DMV and seriously need to get this resolved as it is my work vehicle.