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Code 038 means the computer is getting a high voltage return in the heater circuit from the O2 sensor mounted after the catalytic converter. The O2 sensors have an internal heater to make them work as soon as you start the engine.
You would need to test the circuit to and from the sensor to find the real problem.
I called Kia about my check engine light and I told them my mechanic read the computer and it says 02 sensor. She told me Kia does not sell out there codes to the computer in our cars and that I would have to take it to a Kia repair shop to get the correct reading form the computer
My theory is that it could be the injectors clogging. You could first try running a higher octane fuel, then if that doesn't seem to help try using the minimal amount of gas, and add injector cleaner to the tank. If all of this fails to work you can take your vehicle to the dealership where they can run a system analysis on it and help you pinpoint the problem. Hope this was helpful. Please rate my solution, thanks.
Ok I think you meant code P0171, this means the fuel trim is always lean, you need to check for a engine vacum leak, maybe a cut or damaged PCV hose or any other hose that is in the vaccum system, I have read other Kia owners (Kia Forums, you should join one) reports of this same code, most found it not to be the O2 sensor but a vacuum leak.