Kwiksen Oxygen O2 Sensor 234-4703 Downstream For Nissan Frontier Xterra Pathfinder Infiniti QX4 3.3L Direct Plug-In Replacement Cross Reference Part Number: 234-4703 Position: Please check compatibility in Description Warranty: One Year Unlimited Miles This is Brand New High Quality Aftermarket Product. Meet the professional specification as OEM parts, for stable performance durable service.