0445120288
BOSCH 0445120288 Common Rail Injector for Mercedes-Benz Actros MP4 / Antos & Detroit DD13 12.8L
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The Bosch 0445120288 common rail fuel injector represents the pinnacle of heavy-duty commercial diesel injection technology, engineered for the joint Daimler HDEP engine family including the Mercedes-Benz OM 471 (12.8L) and the Detroit Diesel DD13 platform fitted to Freightliner Cascadia and Western Star commercial trucks. Operating under the Bosch CRIN4-21 architecture with amplified pressure capability up to 2100 bar, this injector ensures micro-droplet fuel atomization for Euro 5 and Euro 6 / EPA10-EPA13 emission compliance. Internally, the unit combines the high-flow DLLA118P2203 nozzle (Bosch assembly 0433171878) with the heavy-duty F00RJ14012 pressure-balanced control valve. Common wear symptoms include elevated high-pressure back-leakage, hard starting, diagnostic trouble code P0087 (Fuel Rail System Pressure - Too Low), black exhaust smoke under heavy grade pulling, and cylinder contribution imbalance. Direct replacement with factory calibration eliminates cylinder knock and restores original hauling power and fuel economy.
Crucial Workshop Protocol: When installing Bosch 0445120288 onto Detroit DD13 or Mercedes OM471 engines, strictly follow the high-pressure connector tube sequence: pre-torque the feed tube collar nut to 15 N·m before final hold-down clamping (20 N·m + 90° TTY), then torque the tube nut to 40 N·m. Always code the 6-character IMA adaptation string into the CPC/MCM control modules.
Vehicle & Engine Fitment
| Vehicle | Engine | Years |
|---|---|---|
| Mercedes-Benz Actros MP4 / Antos / Arocs 12.8D | Detroit Diesel DD13 / DD15 (Mercedes-Benz OM 471 12.8L) | 2011-2022 |
| Setra ComfortClass / TopClass 400 / 500 | Detroit Diesel DD13 / DD15 (Mercedes-Benz OM 471 12.8L) | 2011-2022 |
| Freightliner Cascadia 12.8D | Detroit Diesel DD13 / DD15 (Mercedes-Benz OM 471 12.8L) | 2011-2022 |
| Western Star 4700 / 4900 12.8D | Detroit Diesel DD13 / DD15 (Mercedes-Benz OM 471 12.8L) | 2011-2022 |
Technical Specifications
| Specification | Value |
|---|---|
| Part Number | 0445120288 |
| Brand | BOSCH |
| System Type | CRIN4-21 (CR/IPL36/ZERIS70S) |
| Operating PressureCore Spec | |
| Emission Standard | Euro 5 / Euro 6 / EPA10 |
| Control ValveCore Spec | |
| Nozzle CodeCore Spec | |
| Nozzle Part NumberCore Spec | |
| Injector Hold-Down Clamp Torque | 20 N·m + 90°📐 Torque & Angle Wizard → |
| Connector Tube Torque | 15 N·m Pre / 40 N·m Final |
| Fuel Line Nut Torque | 35 N·m |
| Copper Washer Thickness | 1.50 mm |
| IMA Coding Required | Yes (IMA/IQA Calibration) |
| Warranty | 12 Months |
Frequently Asked Questions
Which engines and heavy-duty commercial vehicles use Bosch injector 0445120288?
Bosch 0445120288 is engineered for heavy-duty commercial applications powered by Mercedes-Benz OM 471 (12.8L) and Detroit DD13 (12.8L) inline-6 engines. It serves Mercedes-Benz Actros MP4, Antos, and Arocs trucks, Setra 400/500 coaches, as well as North American Freightliner Cascadia and Western Star 4700/4900 trucks from 2011 to 2022.
What critical high-pressure feed tube installation sequence must be followed for 0445120288?
To prevent high-pressure fuel leaks inside the cam cover, strictly follow the dual-torque sequence: pre-torque the feed tube collar nut to 15 N·m before final hold-down clamping. Then torque the injector hold-down bolt to 20 N·m + 90° angle, and finally torque the high-pressure feed tube nut to its final spec of 50 N·m. Always install a new copper sealing washer and new tube O-ring.
Does Bosch 0445120288 require ECU calibration coding after replacement?
Yes. Each Bosch 0445120288 injector carries an individual IMA/EMA calibration code laser-etched onto the electrical connector body. This code must be programmed into the MCM (Motor Control Module) or CPC using Mercedes-Benz XENTRY or Detroit Diagnostic Link (DDDL) to balance cylinder-to-cylinder fuel delivery and avoid rough idling.
What are common failure symptoms and test bench limits for 0445120288 on OM471/DD13 engines?
Common symptoms include extended warm cranking, engine derate under heavy haulage, elevated fuel dilution in engine oil, and fault codes P0087 or SPN 157 FMI 18 (low rail pressure). Dynamic backleak testing at 2,100 bar rail pressure should show return leakage within Bosch CRIN4 factory test plan tolerances (less than 45 ml/min at full load).
Diagnostic Trouble Codes & Fault Protocols
Common diagnostic trouble codes (DTCs) triggered when this common rail injector experiences wear, circuit faults, or calibration drift:
Fuel Rail / System Pressure Too Low
Excessive internal backleak from worn control valve seats drops common rail pressure below target under engine load.
Injector Circuit Malfunction / Open Circuit
Solenoid coil resistance drift (0.2-0.5 Ω) or piezo stack degradation triggers driver stage shutdown on affected cylinders.
Cylinder Misfire & Balancing Deviation
Carbon-clogged nozzle spray holes or missing IMA calibration causes uneven cylinder contribution. Recode ECM and verify washer seating.
Fuel Rail / System Pressure Too High
Spill line backpressure or stuck metering valve prevents rail depressurization, creating overpressure risks under load.
Cross-Reference & Compatibility
Sister parts, same-platform variants, and known incompatibilities.
Technical Diagnostic & Service Protocols
Authoritative field procedures, diagnostic testing thresholds, and service SOPs for this assembly.