Have you ever had a intake gasket problem? Any coolant getting into your combustion chamber can seriously screw up an O2 sensor. Another thing could be the amount of flow you have. Headers and high flow exhaust can make an 02 "freak out" sometimes as well. Did this happen at WOT? Might be nothing to worry about, unless you want to get an O2 bypass so you don't have the problem again.
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