i've run into this before the engine light even though it says it is a 02 sensor code doesn't neccessarely mean that the o2 is bad... it could be that the 02 is reading a lean or rich condition.... I had that problem it showed an 02 code and it ended up being a rich condition in the motor cause on of the injectors was bad... do a little more investigating...
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Hitech Stage II's= 310rwhp 318rwtq 
350rwhp 395rwtq N2O
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