Question about 2005 Saturn VUE

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Why does my check engine light go on and off by itself

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The check engine light comes only when the computer control unit (called the PCM) senses a fault in the electronic controls of the engine and/or the emission system, there are about 200 possible faults that turn the light on, to know what has developed a problem you must have the system tested, this is called an OBD2 fault code test, Kragen and Autozone parts stores do this testing for free.

Posted on Jun 01, 2010

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Hi. this is common. when on, it is indicating that it will show a problem if scanned. go to any AAMCO repair shop for a free scan, or to some autoparts stores. When it is not on it may or may not show the problem. J.

Posted on Jun 01, 2010

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Does the check engine light reset itself once the


If you are a DIY'er you can get a OBDII scan tool that connects to your laptop that can tell you the error code and allow you to reset your check engine light. This will save you $80 each time over going to a mechanic for a diagnostic. They are easy to use and will help you know what the issues are if you do have to go to a mechanic.
Check out http://www.fitityourself.netau.net/OBDII.html
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