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Goss Oxygen Sensor - 5 Wire - OX426 [Suit Holden Commodore VZ, Rodeo] Holden Belmont NGK Iridium Spark Plug -Goss Oxygen Sensor 5 Wire OX426 [Suit Holden Commodore VZ, Rodeo] Fits: Holden Adventra, Calais, Caprice, Colorado, Commodore, Crewman, Rodeo, Statesman The Oxygen Sensor (or Lambda sensor) is an electronic device that measures oxygen content in the exhaust gases of an engine. It outputs a signal to the engine control unit (ECU), which adjusts the air fuel mixture to obtain the required level.