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A variety of codes could be set to illuminate the Check Engine light, most likely it is an O2 Sensor code but to be on the safe side have it read. After a few thousand (> 30K) miles it isn't uncommon for the light to come on. My advise, Get it checked.

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Q: My check engine light is on not the maint req light in my 2003 Honda accord What could be wrong?
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