The Cummins 549142200 NOX sensor is a crucial component for modern diesel engine exhaust aftertreatment systems. This genuine OEM nitrogen oxide sensor accurately monitors exhaust gas composition, providing essential data to the engine control module (ECM) for precise fuel injection adjustments and effective emissions reduction. Designed for various Cummins heavy-duty engines, including the X15, ISX15, and ISX12 series, it ensures compliance with stringent emission standards and maintains engine efficiency. This 24V sensor typically features a 5-pin connector and is utilized in both upstream and downstream positions within the exhaust system.