Oxygen sensors, or O2 sensors, are required to perform a critical function on your vehicle in the harshest of environments: Measuring the oxygen content of the exhaust just after it leaves the cylinders. The oxygen sensor has to accurately check this red-hot exhaust hundreds of times per minute and send that data to the vehicle computer. The fuel/air mixture hangs in the balance, and you're probably familiar with the symptoms of a bad oxygen sensor: Black smoke from the exhaust, a rotten-egg odor, and poor performance and fuel mileage. Fortunately, a bad O2 sensor doesn't require a trip to the dealer parts counter. We have oxygen sensors from the top oxygen sensor manufacturers at great prices. Bosch oxygen sensors are original equipment on hundreds of vehicles, and we have Bosch O2 sensors for most of them listed right here. A new Bosch oxygen sensor will restore like-new performance to your import or domestic car, truck, van, or SUV, and you know you're getting an oxygen sensor that's made to the rigorous specifications of your original equipment oxygen sensor.