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Originally Posted by CL8
In training I was told when the Check engine light comes on it means the computer senses too much pollutants coming from the exhaust system.
2. Is that correct, and is there a difference between the check engine light and the emissions warning light?
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anything emissions-related will set the light, although the umbrella of what is considered "emissions-related" is very broad.
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3. Why would the light have stayed on for two days after that?
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depends what code was set. Some codes are "hard codes" and will not turn off until reset. Other codes are retested and will shut off on their own. But your code seems to be a hard code.
Different manufacturers do it differently. I've seen similar situations set a MAF out of parameter code on GM's, but whatever it is, it isn't really important. Just get the code reset and you'll likely be fine.