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Just wondering why some codes don't set off the CEL light? 
CEL Question
- Thread starter bluebombersfan
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- Nov 4, 2008
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- Vehicle Year
- 2006
- Transmission
- Manual
found an article explaining
I found this article on the web explaining why you can't always rely on the Check engine Light
The determining factor as to whether or not the Check Engine light comes on is usually the effect on emissions. In many instances, emissions can be held in check, despite a faulty sensor, by adjusting fuel trim, which the engiencomptuer does automatically. So as long as emissions can be kept below the limit, the OBD II system may have no reason to turn on the Check Engine Light.
I found this article on the web explaining why you can't always rely on the Check engine Light
The determining factor as to whether or not the Check Engine light comes on is usually the effect on emissions. In many instances, emissions can be held in check, despite a faulty sensor, by adjusting fuel trim, which the engiencomptuer does automatically. So as long as emissions can be kept below the limit, the OBD II system may have no reason to turn on the Check Engine Light.
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