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I have seen aftermarket O2 sensors have different values, if that is what you used. There are so many variables with a run problem, is this the only code, did you clear the codes after installation of new O2? If you did, how many heat cycles did the car go thrugh before the code came back or did it show up as soon as the motor fired? Not knowing what you are working on, that's about all I can tell you now. With more info maybe I can help
Drives : 2000 2.5 RS USDM STI block, SOHC heads GT25 Ball bearing turbo, TMIC, TXS BOV, Tial wastgate, etc...
it is a subaru wide band O2 sensor, not an aftermarket sensor.. The code comes on when i let the car idle for about 5 minutes, or it will turn off and then come back on, while i am driving under normal conditions.. this is the only code that I am pulling, and yes I have cleared the codes.