How do you know if your cars oxygen sensor is bad? Here are some of the most common signs that your oxygen sensor is bad.A Glowing Check Engine Light. The bright orange Check Engine light in your dashboard will usually glow if you have a bad oxygen sensor. Bad Gas Mileage. An Engine That Sounds Rough. An Emissions Test Failure. An Older Vehicle. What happens when the O2 sensor goes bad on a Chevy Aveo? When an O2 (oxygen) sensor go bad, it’ll cause your Chevy Aveo ‘s engine to run less efficiently. Your Aveo can exhibit symptoms when the...