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Goss Oxygen Sensor - 5 Wire - OX436 [Suit Ford Focus, Ranger, Holden Commodore, Hyundai, VW] 7113 NGK Spark Plug LFR5B NGK Racing Spark Plug -Goss Oxygen Sensor 5 Wire OX436 [Suit Ford Focus, Ranger, Holden Commodore, Hyundai, VW] 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.