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Your Honda Civic Oxygen Sensor allows your engine-control computer to keep the air/fuel ratio consistent. This allows your engine to run more efficiently, which keeps your gas mileage at its optimum level; especially important considering today's gas prices. Located in the exhaust manifold, the Oxygen Sensor accomplishes this by detecting the amount of oxygen present in the exhaust stream and then signaling the engine-control computer with the amount of fuel needed for the proper air/fuel ratio. Your Honda Civic is legendary for its high quality and extreme durability, and every part on it contributes to this total quality picture. You can expect your Oxygen Sensor to last for 50,000 miles or more. However, there are situations which can occur that cause your Oxygen Sensor to become contaminated or even to stop working completely. If you must replace your Honda Civic Oxygen Sensor for any reason, make sure you only install high quality parts that complement the quality and durability your Honda Civic is known for. You do not want to compromise the quality that is built into your Honda by taking a chance on lesser quality parts. You bought a Honda Civic because of these attributes of quality and durability, in addition to classic good looks, and you want to enhance and maximize these qualities by only utilizing the very best quality parts. Auto Parts Network (APN), has a wide selection of quality Honda Civic 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 will always provide you with the best service, competitive prices and the best selection of parts available!