This E85 flex fuel sensor measures the exact amount of ethanol passing through your fuel system into your engine, so your ECU can calibrate and vary ignition timing, boost levels and fuel injection duty cycles. It is a universal fitment with 3/8″ barbs on both ends. Includes plugs and pins, and suits our flex fuel sensor adaptor PFEFS650-10 for easy installation. Replaces GM #13507129.

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