The check engine light came on on my 2000 S40 a few months ago with approx 45,000 miles on the car and went out later the same day. A few weeks later it came on again and did not go out. Took the car to the dealer and they said it had a code for fuel quality and charged me to turn it off. They said I got a bad tank of gas. I had just filled up the day before with Amoco premium. A week later in came on again and went out shorty thereafter. Now a few days ago it once again came on, but has remained on. For the record I know about the gas cap needing to be tight. I really don't feel like paying $75 a month to keep getting this thing turned off. Does anyone have any insight?
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