Ok I had my check engine light come on yesterday. Well it's came on before and went off. But it seems to stay on all the time now. I work at Advance and I just went outside and plugged up the scanner. It said p013b something about oxygen sensor slow to response system too lean. Bank one sensor 2. Its got 160,000 miles on it. I don't think the sensor has ever been changed. Any ideas if its just a sensor needs to be changed or something else????