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The Toyota Highlander Oxygen Sensor is a very important part for this type of vehicle. Because a Toyota Highlander is a larger vehicle and perhaps not as fuel efficient as some smaller vehicles out there, the Oxygen Sensor is an especially important part. The Oxygen Sensor senses the amount of oxygen in your Toyota Highlander's exhaust stream and assists in adjusting the air/fuel mixture in response to this, so that your Toyota is burning fuel as efficiently as possible. This will help your Toyota Highlander to burn fuel most efficiently and achieve the best gas mileage possible, as well as help to keep emissions at their lowest possible level. Your Toyota Highlander has Toyota's legendary reputation for quality and durability behind it and you can expect the Oxygen Sensor to function reliably for the long term; 50,000 miles or more. If at some point you do need to replace your Toyota Highlander Oxygen Sensor, make sure you only install parts that are also of high quality and durability, to complement these qualities in your Toyota. You chose a Toyota Highlander because of these same features of quality and durability, in addition to its superior performance and sporty good looks. You do not want to compromise these attributes by installing lesser quality parts on your Toyota. Choose a manufacturer whose focus is on high quality and durability, to enhance and maximize these qualities in your Toyota. In addition, make sure you select a manufacturer who has experience making parts for Toyotas specifically, to ensure proper fit and function. Auto Parts Network (APN), has a wide selection of quality Toyota Highlander Oxygen Sensors. We provide the very best customer service and have knowledgeable experts available to help you choose the right parts for your vehicle. APN constantly strives to do our best to provide you with superior service, competitive prices and the best selection of parts available!