Attention! Bank 1 Sensor 1 means Upstream Right/Rear; Bank 2 Sensor 1 means Upstream Left/Front; Bank 1 Sensor 2 means Downstream Right/Rear; Bank 2 Sensor 2 means Downstream Left/Front. Many buyers brought the wrong Oxygen Sensor because they donot pay attention to the plug and the length of the sensor. Please check these 2 features before purchase. Interchange Number：213-9072 Fitment : Compatible with INFINITI G35 V6-3.5 2007 Sedan ; Upstream Compatible with INFINITI QX56 V8-5.6 2007 Upstream Compatible with NISSAN 350Z V6-3.5 2007 Upstream Compatible with NISSAN ALTIMA V6-3.5 2007 Front; Upstream Compatible with NISSAN ARMADA V8-5.6 2007 Upstream Compatible with NISSAN FRONTIER V6-4.0 2007 Left Side; Upstream Compatible with NISSAN FRONTIER V6-4.0 2007 Right Side; Upstream Compatible with NISSAN PATHFINDER V6-4.0 2007 Left Side; Upstream Compatible with NISSAN PATHFINDER V6-4.0 2007 Right Side; Upstream Compatible with NISSAN TITAN V8-5.6 2007 Upstream Compatible with NISSAN XTERRA V6-4.0 2007 Left Side; Upstream Compatible with NISSAN XTERRA V6-4.0 2007 Right Side; Upstream Why you choose CAROCK? CAROCK O2 sensors are manufactured to exacting standards,utilizing the most up-to-date production technology to bring you an O2 sensor that keeps your engine running at its good, for longer Double laser-welded body for durabilit Fast-acting heater for optimal sensor operation Premium sensor tube for accurate data Coated threads for easy installation The sensor achieves optimal engine performance by monitoring the oxygen content in a vehicle’s exhaust and regulating the air/fuel mixture to the ideal ratio of 14.7 parts air to 1 part fuel A correctly operating oxygen sensor ensures efficient engine operation by making sure the engine is receiving the correct air/fuel mixture and thereby preventing the engine running lean or rich A defective or sluggish oxygen sensor can cause a variety of issues, like decreased engine performance. Replacing a defective O2 sensor helps ensure your engine is constantly monitored and operating efficiently, while maximizing performance. The catalytic converter is responsible for removing the harmful emissions from your vehicle’s exhaust. A defective oxygen sensor can cause your catalytic converter to fail prematurely. Replacing a catalytic converter can cost thousands of dollars, significantly more than most standard oxygen sensor replacements. If complete combustion is not maintained, other chemical compounds can form in large amounts. These include greenhouse gases, carbon monoxide and excess hydrocarbons. Replacing a defective oxygen sensor is the most effective way to control the combustion process and reduce emissions.