I just purchased a S90 T6 with 15K miles on it. I have driven it approximately 500 miles. This morning my CEL came on and I have no information or idea how to check up on this in the car… Any assistance would be appreciated. Meetings all day, no time to call dealer. 
You should have some of the original factory warranty left. This is an expensive vehicle and you can’t find time to call a dealer ? Even if you have the codes read can you do the repair ? If not then you need a shop to look at this thing.
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In most places, auto parts stores will read the codes for free, so maybe you could stop at one of them soon.
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A loose gas cap can do it.