Question about 2002 Kia Optima

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2002 kia optima wont pass emissions. check engine light was on, then turned off. how to reset computer

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  • Anonymous Mar 18, 2014

    odometer and key light sta on after key removed
    after several days battery goes dead

  • Anonymous Mar 25, 2014

    I have a 1996 Toyota and when I turn the key (with out starting ) the check engine does not turn on and it wont pass emission test because if it what may be causing this

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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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