First, you should check to see if there is a thermostat in the engine or if it is stuck open.
It will take care of the P0128 data trouble code for (coolant thermostat malfunction), and it will most likely take care of the other code P0172 (fuel trim too rich bank bank #1) because it will not take so long for the vehicle to warm up. But I have also seen the code P0172 because of a dirty MAF (mass air flow meter) and it can be cleaned with carburetor spray.
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will that fix both codes?
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