Question about 2002 Kia Optima

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02 kia fail smog high nox

Car came in with e ligth on said 02s on bank one slow replace o2s a run smog car fail nox 1700 @ 15 and 1800 @ 25 heeelp

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  • tuzouno Jun 17, 2009

    i did repacle the o2s both banks the firs one on each bank but i set the monitors and after that is when it fail i also make sure there is no exhaust leaks near any o2s any other ideas

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If the engine computer says that you have a slow O2 sensor what it means is that the sensor does not react as quickly as it should and it needs to be replaced. nox is oxides of nitrogen, a product of too lean combustion which causes cylinder temps to go too high. it sounds like replacing O2 sensor will make it happy. engine computer is having a hard time controlling lean/ rich fuel mix because sensor is slow to register changes, needs to have response time in milliseconds or engine computer can't operate properly. O2 sensors do wear out, normal service item. hope that helps

Posted on Jun 17, 2009

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