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Q: Check engine light on 1994 Oldsmobile Silhouette

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My check engine light comes on/off. The vehicle is at 150XXX miles but the engine is not (new engine). Vehicle is slugish at times and needs a tune up but this would not call for the engine light coming on. Is this a preset command in the computer? How is this reset.
No car image 94a1663db56199c5353592009e34aaa51078a2469bed068bb8d6f0ba43accf97
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Sounds like a failing oxygen sensor, sometimes weak oxygen sensors will make the check engine light go on and off.
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