I reconditioned my car's oxygen sensor by soaking it overnight in Apple Cider Vinegar (common kitchen vinegar would also do the job just as effectively). Soak it overnight. Then in the morning, scrub it good with a tooth brush paying special attention to inside the holes, followed up by blasting through the holes with Nasa carb cleaner. Dry the sensor in sunlight before putting it back. However if your sensor's heater element is damaged, you'll have to get a new one. You can test it with a simple multimeter. The resistance between both black wires should be between 5 to 8 ohms at room temperature. If it's a short circuit or an open circuit, time to get a new sensor.
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