need to know how to reset the comp after turning off check engine lite


Asked by Jan 29, 2014 at 12:39 AM about the 2000 Hyundai Sonata GLS

Question type: Maintenance & Repair

i had to replace 02 sensors then turned off check engine lite only when i took it in for inspection it failed comp didnt read anything something about a drive cycle its a 2000 sonata gls 103700 mils 6 cyl

1 Answer


Once the repairs are made and the computer is cleared the readiness monitors must reset before it will pass an emissions inspection. As you drive the computer runs tests on the different emissions systems (EGR, EVAP, Oxygen Sensors, etc.) Once the computer decides that the systems have passed enough diagnostic tests the readiness monitor for that system shows "ready". To get these to set there is a specific "drive cycle", too lengthy to outline here, that can be done to get the readiness monitors to set right away. What you can do that is much easier is keep your gas tank between 3/4 and 1/4 full. No more and no less! Then just drive normally for about one week. During this time the readiness monitors will set. If it's cold where you're at the readiness monitor for the EVAP system probably won't set. But that's ok. Since your vehicle is a 2000 model it will pass if all but 2 readiness monitors are set. 2001 models and forward must have at least all but one set. HTH. -Jim

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