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Bad O2 Sensor?

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Over the past 2 weeks my car has started acting up. What its doing is it will bog under accel or if I open the throttle past a quarter, after driving it like in "bog mode" for extended time (engine is constantly bogging) the cel will come on (ecu diag code 1 i think- oxygen content). Also does it if revving without load. Honestly it sounds similar to a wrx w exhaust; I did add an aftermarket exhaust like 2 months ago if that helps at all.

Seems like the O2 sensor may be fouling, but not 100% any thoughts.

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