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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.
One of the key sensors in this system is the oxygen sensor. Its often referred to as the O2 sensor because O2 is the chemical formula for oxygen (oxygen atoms always travel in pairs, never alone). The first O2 sensor was introduced in 1976 on a Volvo 240.