02 Grand Am Ck Engine Light

02 Grand Am,2.3L , 70k. Check engine light started coming on now and then at about 50K.This happened after the tank reached 1/2 tank. If I filled it the light would reset a short time later.I replaced the cap.I have the factory manual but no code scanner (I am looking to get one). What are the next most likely items that would cause this? The cars starts and runs great.
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DanFXR
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Shep

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