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The check engine light comes on when the computer sees a system fault and when this happens the computer will set and store a fault code and or codes. In order to know which sensor is failing you would need to have the system scanned. That being said In most cases you will not notice any difference in the way the engine runs because the computer system has a back up strategy . As long as the light is not flashing you are safe to wait till you can get it in and no harm will be done by doing so. If you have more questions and or need more help post back and we can work from there.