2006 Kia Optima

Hey guys i have a 2006 kia optima, and when idling for about 3-4 minutes white smoke starts to come out my tail pipe, or when im idling at a red light, but the car isnt over heating or losing any coolant. Does anyone think they might know what it is?

Any check engine lights or drive ability problems?

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How long of trips/drives are you taking ?

After driving for 1/2 hour or more, does it still have the white smoke?

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Yes the check engine light is on, i got a code for a O2 sensor may that be the problem?