Ok as you all know I have been posting because I have been having problems with o2 sensors in my 97 caddy concours. I first I replaced 2. "service engine light" went off. Then came back on reading to me that it was a o2 "heater sensor" bought 2 more. "service engine light" went off. So now I have 4 brand new o2 sensors in my car. I just got home and the LIGHT came BACK on!! saying its the heater sensors in the o2's? come on now! could this be some sort of glitch???? pleeeaaaasssseeee help me guys before it is too late so i can sell this thing!