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One of the newer OBDII (On Board Diagnostic revision 2) code scanners will allow you to reset the light and it will help you figure out what's wrong at other times too. They are well worth the cost. If the gas cap is the only problem, then once it's replaced, it should take about 2 to 3 days for the light to go out. If it doesn't go out automatically, then take it back to the dealer or get one of these OBDII's. This information is actually in the owner's manual.

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โˆ™ 2006-06-22 15:29:58
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Q: How do you reset the check engine light on a 2005 Trailblazer caused by a missing gas cap?
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