Bosch 0445120212 High-Pressure Fuel Injector – Direct Replacement

The Bosch 0445120212 is a high-performance solenoid-type common rail injector engineered for Cummins ISBe and ISLe series mid-range engines, as well as select VW commercial vehicles and Case IH agricultural machinery. As a critical component in the high-pressure fuel injection system, this injector precisely meters and atomizes diesel fuel for optimized combustion efficiency. Designed to meet rigorous OEM specifications, the 0445120212 injector ensures reliable cold starts, reduced particulate emissions, and consistent power delivery under varying load conditions. For heavy-duty workshops and diesel parts suppliers, this Bosch common rail injector represents a factory-spec solution for restoring engine performance in platforms ranging from VW Worker trucks to New Holland tractors .

The Bosch 0445120212 operates as a solenoid-actuated injector within the common rail system, featuring a DSLA143P5501 nozzle type and a control valve assembly (part F00RJ02130) that governs the precise opening and closing events . With a net weight of approximately 0.88 kg, this unit incorporates a grey electrical connector and is supplied with the necessary seal ring for immediate installation . The injector's internal hydraulic circuitry is calibrated to deliver fuel at pressures up to 1,600 bar, utilizing a two-spring design that ensures consistent pilot and main injection events. Key service components include the F00VC17503 sealing ring and F00RJ00414 high-pressure connection, which are critical for maintaining system integrity . This 0445120212 model is not remanufactured; it is a genuine Bosch new part, identifiable by its distinct manufacturer number and compliance with ISO 9001 quality standards.

This common rail injector serves as a direct replacement for multiple OEM numbers, including Cummins 5255184, Case IH 2830957, Ford BG9X9K526BA, and VW 2R0198133 . It is primarily utilized in Cummins ISBe4 and ISBe6 engines found in VW Worker 9.150 through 24.250 series trucks (model years 2008-2011) as well as the Constellation 24.50 . Beyond on-highway applications, this injector is a critical component for Case IH and New Holland TS-A series tractors, specifically the TS110A model, making it a versatile stock keeping unit for agricultural equipment suppliers . For Ford applications, it aligns with specific engine codes where the BG9X-9K526-BA part number is specified. This broad cross-reference profile ensures that repair shops servicing diverse fleets-from European commercial vans to North American agricultural machinery-can rely on a single part number for multiple vehicle platforms.

Proper installation of the 0445120212 requires meticulous attention to fuel system cleanliness and torque specifications to prevent premature failure. Before installation, technicians must clean the injector bore to remove carbon deposits that could compromise the seal . Always replace the copper washer and O-ring with new components, lubricating the O-ring with clean engine oil to avoid extrusion during assembly . The injector hold-down bolt must be tightened to 50 Nm (37 ft. lbs.), while the fuel return line eye bolts require 16 Nm (12 ft. lbs.) . Critical to the repair process is the use of a hydraulic puller if the injector is seized-forcing removal can damage the cylinder head . After installation, it is mandatory to perform injector coding using diagnostic software to input the unique IQA (Individual Quantity Adjustment) code; failure to do so results in rough idling and reduced fuel economy due to the ECU's inability to compensate for manufacturing tolerances . Always cap exposed fuel lines during the swap to prevent dirt ingress, which is a leading cause of scored plunger damage in the high-pressure pump.

Parameter	Specification / Value
Manufacturer	Bosch
Part Number	0445120212
Fuel Type	Diesel (Common Rail)
Nozzle Type	DSLA143P5501
Control Valve	F00RJ02130
Connector Color	Grey
OEM Equivalents	5255184, 2830957, 2R0198133, BG9X9K526BA
Primary Engine Fit	Cummins ISBe / ISLe, VW Worker
Sealing Kit	Includes F00VC17503 O-ring, Copper Washer
Install Torque	Hold-down Bolt: 50 Nm; Return Line: 16 Nm
Core Component	Solenoid Actuator, Two-Spring Design

Q1: Can I reuse the IQA code from my old injector?
A: No. Each 0445120212 has a unique IQA code that must be programmed into the ECU. Reusing the old code causes cylinder imbalance, rough idling, and increased emissions.

Q2: How do I spot a counterfeit Bosch 0445120212?
A: Check laser etching quality and connector fitment. Genuine units have consistent solenoid resistance and proper o-ring grooves. Counterfeits often show poor machining and missing EAN 4047024504431.

Q3: What symptoms indicate injector failure in Cummins ISBe?
A: Rough idle, white/black smoke on startup, poor fuel economy, and excessive leak-off flow during cylinder cut-out tests are primary indicators.

Q4: What is the typical service life?
A: With proper 2-micron filtration, these injectors last 400,000–600,000 miles in highway use or 8,000–10,000 hours in agricultural applications.

Q5: Are sealing rings included?
A: The box includes the copper washer and O-ring, but replacing high-pressure connection tubes separately is recommended due to work hardening risks.

 

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