| Where is the smoke coming from? Out the exhaust or from the sensor itself? What color? What does it smell like? If it is out the exhaust, it is not likely to be the sensor. More likely you have a broken piston from detonation as a result of the low octane. If the sensor is smoking under the car, then it could be oil or water dripping on it from a leak or the sensor could have a short. I have never heard of a sensor shorting out but it could be possible I suppose. KKrofft
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