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OE-Replacement ShopEddies Visit Our Store Feedback Newsletters Contact Us Denso 234-4437 Oxygen Sensor (Air and Fuel Ratio Sensor) Description OE-Replacement DENSO's light duty oxygen sensor started to appear on vehicles with the development of fuel injection systems. The basic job of the sensor is to monitor the air fuel mixture under idle, moderate acceleration and cruise conditions. Under heavy acceleration the oxygen sensor goes into "open loop," which basically means that the engine managem...

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