View 2 Photos View 0 Videos Caterpillar C4.4 NOx Sensor for Caterpillar C18, C7.1, C9.3, C9.3B, C3.6, C4.4, C13, C15 Recently Updated $750 USD (NEW/ OPEN BOX) Caterpillar OEM Nitrogen Oxide Nox Sensor NOX Sensor, for sale!!!Part #: 539-0117; Supersession Part #: 441-5129, 11R-1773; Engine Models: C18, C7.1, C9.3, C9.3B, C3.6, C4.4,... ConditionNewFits To Make(s)CaterpillarFits To Model(s)C18, C7.1, C9.3, C9.3B, C3.6, C4.4, C13, C15Part Number539-0117Stock NumberNOX7 MLS Number11891815CategoryNOx Sensors Last Updated9/2/2026 LocationHialeah, FL, US Sold ByJJ Rebuilders Inc. (844) 385-___ SHOWNUMBERCall Seller Email Seller Save More Info