Question about 2003 Chevrolet TrailBlazer

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Ny service engine light is on and Ineed to know how to reset it

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  • Chevrolet Master
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If there are no issues, the light would go out. Something must be wrong.

Go to a place, like lube place, or a shop and pull the codes. Then you will know what needs attention.

Stuff like throttle position sensors, oxygen sensors, temp sensors (meaning fairly easy to replace), once you know the offending item. If multiple codes, do more research, there will be a most common failure item, like a TPI sensor. Do the statistically common one first, clear the codes, and see if the other item was reacting to the 1st item.... OFten it does, sometimes you have more than one issue.

For example, if TPI sensor made the engine really rich, the oxygen sensor may be covered and not work well....

Posted on Jul 12, 2010

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  • Chevrolet Master
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First, read the codes using and OBD-II scanner. Then, clear the codes with the 'clear codes' button when connected to the scanner connector under the dash.

Posted on Jul 12, 2010

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Posted on Jan 02, 2017

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