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If the sensor is working fine, then it is flipping from 0-1-0 voltage constantly.
And if it is doing that, then you are not lean during closed loop! (thread topic)
In other words... ( I love saying that ) The only way we have of knowing a car is actually in closed loop (besides having some kind of OBD monitor device) is to watch the o2 voltage flip back and forth. If it's flipping back and forth... your O2 is working and your car is in closed loop doing what it should be doing.
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