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The "Check engine" light is the only way the computer has to tell you that it has detected a problem. You'll need to use a code scanner to read the diagnostic codes. The check ingine light is actually telling you that there is a problem somewhere in your emissions system. Emissions can be anything from your oxygen sensor to your air intake sensor and anythin inbetween. If you take your vehical to auto zone and let them check your computer it will tell you what needs to be changed. If it comes back with no codes, then they can reset the computer for you and turn off your "check engine" light. If they won't turn it off for you, then simply remove the positive battery cable for about ten seconds and then put it back on, theat should reset your computer also but you will ned to reset your radio stations too.

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Q: Why On a 2000 sephia the check engine light comes on and you have changed plugs fuel filter air cleaner and no codes show you done all you can think of any suggestions?
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