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Unstable, because oxygen is a diatomic element meaning that O (charge of -2) cannot stand alone, when not in a compound it must be O2. So it has a charge of -4.
When the computer receives a rich signal (high voltage) from the O2 sensor, it leans the fuel mixture to reduce the sensors reading. When the O2 sensor reading goes lean (low voltage), the computer reverses again making the fuel mixture go rich.