Question about 2002 Kia Optima
Reseting the cpu will clear the check engine code however it will not fix the problem that caused the check engine light to come on. The most common cause of failing emissions is the O2 Sensor. This sensor will trigger the check engine light when it is failing. The good news is that the Oxygen senser is pretty cheap and is mounted on your exhuast so it is fairly easy to replace yourself. I suggest replacing your O2 sensor the clear the computer by disconnecting the negative battery terminal and leave it disconnected for a few moments, hook up the negative again and it's all clear. Take your car back threw emmisions and you should be all set.
Hope this helps
Posted on Jun 27, 2008
Trouble is the O2 sensor on this model is NKT cheap, even at trade price you are talking £127.00, so i dare not go to a dealer for a genuine one as they are asking nearly £180.00 ofr the same thing.
So being as it only flashes the fault up once a month, i bought a cheap OBD2 monitor [£25.00] and reset the light this way, as using your method, you reset all the auto box/driving style parameters every time you disconnect the battery as doing this, wipes all the ecu memories of driver adapted parameters.
Posted on Oct 03, 2008
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Posted on Jan 02, 2017
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The information below was complied by me, it explains what causes the check engine light to come on and the process of finding the cause.
When the Check Engine light (or Service Engine Soon or small picture of an engine) is turned on, the systems computer control unit (called the PCM) has sensed a fault in the electronic controls of the engine and/or the emission system. When this happens you will seldom feel the car engine run any different. There are about 200 possible system faults (the gas cap is just one of them) that turn the Check Engine light on, to know what has developed a problem you must have the system tested, this is called an OBD2 fault code test, Kragen/Oriley and Autozone parts stores (USA only) do this testing for free.
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