Volvo Mack NOx Sensor – Skyline OE Manufactured – Replaces 22303384Maintain the efficiency of your aftertreatment system and ensure strict emissions compliance with the Volvo Mack NOx Sensor by Skyline. As an OE manufactured component, this sensor provides the high precision monitoring required to measure Nitrogen Oxide levels in your exhaust stream. Specifically designed for the outlet (downstream) position, this sensor is a critical link in your engine's ability to manage DEF dosing and prevent costly "limp mode"