Bosch 0445120241 Fuel Injector Assembly

The Bosch 0445120241 is a high-pressure common rail fuel injector designed for Cummins 8.9L and 9.0L diesel engine platforms including QSL9, ISLe, ISC, ISCe, and QSC series. It utilizes solenoid-actuated CRIN1/ZIRIS10S technology with a DLLA144P2199 nozzle assembly to deliver precise fuel metering and atomization at rail pressures up to 1800 bar. The injector body is manufactured from high-grade alloy steel with hardened needle valve and control valve components to withstand extreme cyclic loading and corrosive fuel environments. This assembly serves as a direct OEM replacement for Cummins part numbers 5263304, 4930485, and 3976631. It is compatible with Bosch predecessor part number 0445120070. Applications span on-highway heavy-duty trucks, transit buses, construction equipment such as excavators and dump trucks, industrial generator sets, and marine propulsion units. Installation requires high-pressure fuel line torque specifications per Cummins service manual and injector calibration code programming via ECM where applicable.