Check engine light on after adding #91 gas to a 05 honda accord?

I normally just use #87, under which my car runs pretty good. However to see the difference of premium gas i added about 10 gallons #91 mixing with 5 gallons of #87 which was originally in the tank to my car. After few minutes of driving check engine light was on. Could #91 gas caused it? What should I do?

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