LB2.5rs

im driving a 2000 2.5rs, yes all the recalls have been done. I dont know what the O2 code is. Alright, we called the delear, but we just got a anwsering machine. So we called our mechanic, and he said that the 2 things couldof failed cause of eachother. So he told me to bring the car down, and hed turn off the light. I had just gotten back from pickin up my gf, and when i started the car again, the check engine light was off. So hopefully the light doesnt come back on. And i got my spark plug wires, so i should have those on soon. I also finally got the gasket for the exhaust.