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Q: Could a I'll fitting gas cap cause the check engine light to come on? on 2006 Saab 9-3

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It seems that sometimes after refueling ithe check engine light come on. I have tried tightening the gas cap. sometimes the light will go off sometimes not. Other than that the car runs fine I even drove it to a new home a five hour drive, and the car seems to be fine, just this light won't go off
(1) Answer
A proper diagnostic scan will reveal the truth. Yes, a poorly fitting gas cap can cause the MIL to light, but in theroy, the light would stay on until the cap is replaced and the codes cleared.