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On the ICP code, that is either the sensor itself or the harness going to it. I would start with the sensor. If the sensor is replaced and the code retruns, then check the harness over for abrasions and then ohm test it to the ECM.
On the injector code, look at the plug for the injector #3. It will be the 3rd plug back on the valve cover. See if there is oul around the plug. If so, replace the valve cover harness. Unplug the and look. You want no oil seepage at all. I tend to see that code when the oil is pushing around the plug into the harness.
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