well my check engine light was on before for a coolant temperature sensor. i replaced it. as soon as i turn the ignition on, the check engine light wasn't on anymore. but i noticed when i drive it for about 10 minutes, the check engine light comes on and stays on. but when i turn the car off and turn it back on and the check engine light goes off. and repeats this. so when i park it, i cant do a diagnostic test to see whats wrong because the check engine light isn't on when i first turn the ignition on. does anyone know why this is so?
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problems with check engine light!
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