Burning Excessive Oil, Bad PCV?

I recently bought an 2005 2.4 Honda Accord with 132k miles. Everything on the car is well tooken care of except burning oil. Now I did some research and said it could be a bad pcv valve. I have no leaking oil or oil in the intake and the throttle body. I put a piece of paper over the exhaust for a minute, nothing on the paper. The engine light is on saying a bad o2 sensor, replaced that and the engine light is still on. This is really confusing me and putting me in a loop. As they say there is always a reason someone sells a car. Hopefully mine doesn't have blow by or anything. Thanks!

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