A new oxygen sensor can cost from less than $100 on some models to $300 or more on others, but that doesn't include labor, which can vary widely by vehicle because of where the sensors are located.. The most common bad oxygen sensor symptoms are poor engine performance and rough idle, along with a check engine light on your dashboard. You may also notice reduced fuel economy, and the car may fail an emissions inspection. Here is a more detailed list of the bad oxygen sensor symptoms: 1. Check Engine Light Illuminates.

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An oxygen sensor does not have to fail completely to give you problems. On the contrary, even a failing O2 sensor (sometimes called a "lazy" O2 sensor) may cause your car to have a few issues. If you notice any of the following signs, you may have a bad O2 sensor or one that is about to go bad:. 1. Check Engine Light Illuminates. One of the most common signs of a faulty oxygen sensor is an illuminated check engine light on your dashboard. While a check engine light can indicate various problems, a malfunctioning oxygen sensor is a frequent trigger. If you drive a high-mileage vehicle, there's a good chance that the oxygen sensor is to.