Bosch 0445120076 Common Rail Injector For Mitsubishi Fuso 4M50

This Bosch 0445120076 common rail injector is a genuine OEM assembly engineered for Mitsubishi Fuso FE and FG series trucks powered by the 4M50 diesel engine. Supplied in original Bosch packaging with the Mitsubishi cross-reference ME226793, this solenoid-controlled unit delivers factory-specified fuel metering and spray pattern for reliable cold starts, stable idle quality, and compliant emissions performance across the 2005–2012 production window . Each injector carries a cylinder-specific calibration code that must be programmed into the ECU after installation; this is not a plug-and-play component .

This injector serves the Mitsubishi Fuso FE120, FE140, FE145, FE145CC, FE180, and FG140 4×4 cab-over models equipped with the 4M50 engine . The 4M50 platform also utilized Bosch 0445120049 during overlapping build years, and the two part numbers are not interchangeable despite external visual similarity . Diesel parts distributors and repair shops should verify the engine serial number against the OEM parts catalog before dispatch. Fitting the incorrect injector variant produces persistent rail pressure deviation faults and poor combustion stability that no amount of coding will resolve. For wholesale inventory purposes, the ME226793 Mitsubishi reference provides a secondary verification path when the Bosch label is obscured or the core unit is being matched against a customer-supplied VIN.

Cleanliness at the high-pressure inlet and injector bore determines whether a new 0445120076 reaches its expected service life or returns as a premature failure claim. Before extraction, the engine bay and surrounding fuel rail area should be blown down and the injector recesses vacuumed; residual carbon or grit entering the control valve or nozzle sac causes immediate leak-off escalation and rough running . Fresh combustion seals and hold-down bolts are mandatory, as original hardware yields under heat cycling and cannot maintain the clamping force required for the copper washer to seal combustion gases. After mechanical fitment, a diagnostic scan tool must write the alphanumeric calibration code from the injector body into the ECU for the correct cylinder position. 

For diesel injector repair shops and common rail service specialists, the 0445120076 core holds meaningful remanufacturing value because the nozzle body, solenoid coil, and valve group are all rebuildable with OEM-specification replacement components. The $100 core charge reflected across the aftermarket is not arbitrary-it funds the ultrasonic cleaning, nozzle seat reconditioning, and flow bench validation that a properly remanufactured unit requires . A shop that discards or mutilates cores during diagnosis effectively writes off recoverable margin on every Fuso 4M50 injector job. Equally important: remanufactured units must carry a new calibration code generated on a Bosch 815 test bench after assembly; reman without a valid code sticker or documentation is a liability, not a savings . 

Q1: Can I install one new 0445120076 alongside three existing injectors without causing balance issues?
A: Bosch does not recommend mixing new and high-mileage units on the same rail. The new injector's return flow and pilot delivery characteristics differ enough from worn companions to trigger cylinder contribution corrections that the ECU may not fully adapt out. For a customer-retention repair, quote the set.

Q2: What distinguishes the 0445120076 from 0445120049 visually?
A: Externally the housings are nearly identical. The distinction lies in internal nozzle geometry and calibration data. Never substitute by appearance; verify via the ME226793 label or Bosch laser etching. A mis-matched unit will code and run, but emissions compliance and fuel economy degrade silently.

Q3: My customer's Fuso starts fine cold but cranks excessively when hot. Is this definitely injector-related?
A: Hot hard-start on a 4M50 often traces to injector leak-off rising past the threshold the high-pressure pump can compensate during cranking. Perform a bottle return test on all four before condemning the set. A single outlier injector with elevated return is the usual culprit, though rail pressure sensor drift can mimic the symptom.

Q4: What documentation should accompany a wholesale order of these injectors for resale?
A: Insist on the Bosch original packaging with intact seals, the calibration code label legible on each injector, and a supplier invoice showing the 0445120076 and ME226793 references. For reman units, require the test bench printout and a written core acceptance policy before stocking.

Q5: How long should a genuine 0445120076 last in a well-maintained FE180?
A: Real-world fleet data places genuine Bosch common rail injectors in the 250,000–300,000 km range before return flow exceeds specification, assuming fuel filter intervals are respected and water contamination is controlled . Neglected filtration or repeated rail pressure starvation events shorten that window substantially.

Q6: Do these injectors require programming if I'm installing a matched set of four?
A: Yes. Each of the four injectors carries a unique calibration code tied to its individual flow characteristics. The ECU must learn all four codes by cylinder position. A matched-flow set does not eliminate the coding step; it only narrows the cylinder-to-cylinder variation the ECU must accommodate.