well the other day sparatically the check engine light came on in my car (i didnt have time to check the ecu then) but i did unplug the battery for about 5 min. With that no luck it was still on when i started the car again. the next day however it disappeared, i know there is probably something wrong or it never would have gone on in the first place, does anyone know what can cause a on and then day later off check engine light? (i was thinking o2 sensor? i have no idea)
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