Question about Hyundai Motor 2004 Sonata

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Emissions test comes up not ready - can't pass inspection

Mechanics can't reset the computer for emission testing. I replaced the oxygen sensor. I was told to drive the car to clear the computer. Will I be able to drive it according to the "driving cycle" to clear it? If so, what is the driving cycle. Hyundai has not been able to help. Has this been a problem that has come up with other Hyundai Sonatas i have a 1997 Nissan Sentra that says Oxygen Sensors not ready, Egr not ready Catalist not ready and evap not ready. The car hasnt had work done on it in eight months its been in use those eight months just how long is the drive cycle?

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  • Anonymous Mar 26, 2014

    battery was disconnected, get "not ready" display



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Under the hood, there is a fuse block. I believe it is on the driver's side of your vehicle. Open that box, and pull the "ECU" fuse. Leave the fuse out for at least 5 minutes. Put the fuse back in, start the car, and let it idle for at least another 5 minutes. Do not drive the car, touch the gas, or even look at the gas pedal for these 5 minutes, as the ECU is remapping itself. This will properly reset the ecu and clear the codes. After this you may drive the car.

Posted on May 28, 2009

  • Jayne Jackling
    Jayne Jackling Jan 16, 2015

    I replaced my Cat convertor and now my computer won't complete I can't pass smog will that help complete it for my 2006 sonata 4 cyl ???


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I had a 2001 toyota camry and I couldn't passed the emission test but my friend told me about Xtreme Fuel Treatment and I went back and passed emission. I've also seen improvement in my gas mileage. I brought it at Test it out and see for yourself

Posted on Nov 05, 2009


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