I dont know if it would be a o2 sensor cause my o2 sensor is fouled right now and is always running a self diagnostic and wont come on and my car works fine. It should just run in a constant closed loop sine your o2 sensor is working. Thats what mine does cause my o2 sensor o2 sensor heater, and catlyist monitor all dont work right now. If you can get a friend or someone that has a obd 2 scanner that does monitors hook it up turn your car to on and wait for the misfire and fuel to finish there diagnostic. Then turn the car on and drive around the block just enough were your sensor should be warmed up and if it doesnt come one then it is your o2 sensor.
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