Nitrogen Nox Sensor For Volvo VNL VHD VNR Base Tractor Truck / Mack GU7 GU8 CXU. Mack/Volvo Part #'s 22303390. 1 X Inlet Nitrogen Oxides Nox Sensor. This item is in the category "eBay Motors\Parts & Accessories\Car & Truck Parts & Accessories\Air & Fuel Delivery\Air Intake & Fuel Sensors".The seller is "boss-autoparts" and is located in this country: CN. This item can be shipped worldwide.