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Re: check gngine light
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.
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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.
Have the same problem in our 2002 Spectra. The bad news we received was that in 2002 Kia put some not so good engine blocks in that allowed the crank keeper key to "hog-out" it's slot. This allows the crank to shift a little in timing, which makes cam sensor error and make check engine light come on. Even with a new sensor, it will happen. Our mechanic's best advise was to drive it, local only, until it finally gives way, then find used engine, either newer or older. The only year it would appear to affect is 2002. If your mechanic tears the engine down as though changing timing belt, he or she should be able to see if this is the case.
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
check the belt,if its out it will flag up this code,your car will run on sequential firing from the crankshaft sensor,failing that put an oscilloscope on the signal wire at the sensor and ecu its possible the ecu might not be seeing the signal,start with the basics first