Upgrade your 2011-2012 Nissan Xterra, Pathfinder, or Frontier with our high-quality, modern oxygen sensors. This set includes two upstream and two downstream sensors, ensuring optimal performance for your 4.0L engine. Crafted with durable stainless steel and aluminum oxide, these sensors are built to last. They feature a push-pull output type and are vehicle-specific, fitting seamlessly into your vehicle's existing system. Enjoy precise air-fuel ratio monitoring within a 0-25% O2 range, promoting efficient combustion and reduced emissions. Backed by a one-year unlimited mileage warranty, you can drive with confidence, knowing your vehicle is in safe hands.