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CEL caused by low reference signal???

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P1494, P1496, which are both EGR and there isn't an EGR on the engine. Also P0328 knock sensor. I only have 3.1v when I back probe the knock sensor sub harness with or without the sensor plugged in. This isn't right, unplugged reference should be 5v and plugged into a functional KS should be 2.5v.
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