Your Toyota oxygen sensor is a sensitive part, designed to help to curb environmentally harmful emissions from being released by your vehicle into the atmosphere. It does this by measuring the amount of oxygen remaining in the exhaust after it leaves the combustion system and enters the exhaust system. If there is too much oxygen in the exhaust, your Toyota oxygen sensor signals the main computer of your vehicle, which then adjusts the air-to-fuel ratio in an effort to achieve a more efficient burn, one that will not leave too much oxygen, indicating that the burn was of poor quality and that there is an excess of other contaminants, as well. Because of the influence of your Toyota oxygen sensor on the air-to-fuel ratio, if it is malfunctioning or has failed, you're likely to experience certain symptoms relating to an imbalance in the combustion process. Among the symptoms typical of a Toyota oxygen sensor that is failing to communicate with the main computer of the vehicle are a noticeable reduction in fuel mileage, hesitation when pressing the fuel pedal, an unexpected surging of the engine, failure of emissions tests, and malfunctioning of the catalytic converter. If you need to replace your Toyota oxygen sensor, you'll find just what you need in our extensive online catalog or aftermarket parts and accessories. All you need to do to find the right Toyota oxygen sensor for your year and model is to enter your basic vehicle information, and the most suitable parts for your specific vehicle will be displayed for you to choose from. When you're ready to place your Toyota oxygen sensor order, you can use our secure online ordering system or you can place your order by telephone using our toll-free number.