Will BOSCH 0445120383 fit my vehicle with the Cummins QSB6.7 (also QSB4.5/QSB7) engine?

Check the engine code on the build plate (stamped on the cylinder head or block). If it matches Cummins QSB6.7 (also QSB4.5/QSB7) and the model year is within the fitment range, the injector will physically fit. Verify the nozzle code and control valve stamped on your old injector body before ordering.

What P-codes indicate a failing injector on Cummins QSB6.7 (also QSB4.5/QSB7)?

P0201-P0204 (single-cylinder circuit fault), P2146-P2148 (group 1 COM1 circuit), P2149-P2151 (group 2 COM2 circuit), P0231/P0232 (fuel pressure low/high), P1290 (lambda adaptation out of range). Diagnosis: measure coil resistance at the injector plug (spec: 0.6-1.2 ohm at 20 degrees C).

Do I need to code the new injector to the ECU on Cummins QSB6.7 (also QSB4.5/QSB7)?

Yes. Each injector carries a unique IMA code printed on its label. The ECU stores per-cylinder flow calibration; without the IMA values, the engine will run rough, trigger fault codes, and may fail emissions. Use Bosch ESI[tronic] 2.0, OEM-level scanner, or quality aftermarket (Autel MaxiSys, Launch X431).

What torque values apply to injectors on Cummins QSB6.7 (also QSB4.5/QSB7)?

HP fuel line flare nut (17 mm) 25-30 N.m, hold-down bolt per OEM spec (typically 20 N.m + 90 degree angle), banjo bolt 9-12 N.m. Never use an impact wrench on the HP line — risk of cracking the fuel rail. Use a calibrated torque wrench and new copper sealing washers.

FuelPartsDB

Name: BOSCH 0445120383 Diesel Injector — Cummins QSB6.7 (also QSB4.5/QSB7)
Brand: BOSCH
SKU: 0445120383
Availability: InStock

BOSCH 0445120383 for Cummins QSB6.7 (also QSB4.5/QSB7)

BOSCH · Control Valve F00RJ02472 (Bosch solenoid-actuated, common rail metering) · Nozzle DLLA143P2319 (Bosch multi-hole, secondary source confirmed) · 1600 bar peak rail pressure peak pressure

Primary SKU 0445120383

Engine Family Cummins QSB6.7 (also QSB4.5/QSB7)

Vehicles 3 fitments

Control Valve F00RJ02472 (Bosch solenoid-actuated, common rail metering)

Nozzle Code DLLA143P2319 (Bosch multi-hole, secondary source confirmed)

Operating Pressure 1600 bar peak rail pressure

Vehicle fitment — Cummins QSB6.7 (also QSB4.5/QSB7)

Each row is a verified fitment record from the product's published specification data.

Brand	Model	Engine code	Years	Compatible SKUs
Cummins Inc. (Industrial OEM applications)	QSB6.7 / QSB7 industrial and marine engines	`Cummins QSB6.7, 6.7L, 130-260 hp / 194-220 kW`	2010s-present	0445120383
Dongfeng Commercial Vehicles (Dongfeng Motor Corporation)	Dongfeng QSB-powered medium/heavy-duty trucks and buses	`Cummins QSB6.7, 6.7L, 130-260 hp / 194-220 kW`	2010s-present	0445120383
XCMG (Xuzhou XCMG Construction Machinery Group)	XCMG 200D excavator and other QSB6.7-powered XCMG construction machinery	`Cummins QSB6.7, 6.7L (107x124 mm borexstroke), 130-260 hp / 194-220 kW`	2010s-present	0445120383

All BOSCH SKUs for Cummins QSB6.7 (also QSB4.5/QSB7)

Sorted by SKU. Click any card to open its full product page.

044

0445120383

F00RJ02472 (Bosch solenoid-actuated, common rail metering) · DLLA143P2319 (Bosch multi-hole, secondary source confirmed)

Compatible vehicles

XCMG 200D excavator and other QSB6.7-powered XCMG construction machinery Dongfeng QSB-powered medium/heavy-duty trucks and buses QSB6.7 / QSB7 industrial and marine engines

Pressure

1600 bar peak rail pressure

View 0445120383 →

P-Code diagnostics — Cummins QSB6.7 (also QSB4.5/QSB7)

The ECU uses these fault codes when an injector or its wiring is out of spec. Read the codes with an OBD-II scanner, then refer to the table below to identify the failing cylinder or group.

P0201–P0206

Single Cylinder Injector Fault (#1–#6)

Open or short circuit in the injector wiring harness or failed control-valve solenoid. Each code corresponds to one specific cylinder (P0201 = cylinder 1, P0202 = cylinder 2, etc.). On high-mileage diesel engines, the most common failure is the solenoid coil winding shorting due to fuel contamination past >150,000 km.

📐 Cut-out test at 1500 rpm: disable each cylinder in turn to identify the failing one.

P0300–P0306

Random / Specific Cylinder Misfire

Misfire detected under load or at idle. Can be caused by a faulty injector, insufficient fuel pressure, clogged nozzle, or failed glow plugs. P0300 is random misfire; P0301–P0306 are cylinder-specific. A failing control valve (low return flow) mimics misfire at low rpm.

➡ Run cylinder cut-out test first to isolate the faulty injector. Check fuel rail pressure before condemning injectors.

P0231 / P0232

Low / High Fuel Rail Pressure Circuit Fault

Rail pressure sensor circuit fault (P0231 = low, P0232 = high). Can trigger P0201–P0206 fault codes as a secondary symptom — the ECU cuts injection when rail pressure is outside safe range. Before replacing injectors, verify HP pump output and pressure regulator operation.

⚙ Measure rail pressure with diagnostic tool. Spec varies by load but rail pressure outside 300–3000 bar is suspect.

P0683 / P0684

Glow Plug Control Module Communication Fault

CAN communication fault between engine ECU and glow plug control module. Symptoms include hard cold start, white smoke on cold idle, and rough running until engine reaches operating temperature.

🔧 Replace glow plugs if >3 years old or resistance >1 Ω measured at 20 °C.

Coil resistance spec: 0.6–1.2 Ω at 20 °C. Measure at the injector plug with the harness disconnected. Out-of-range readings indicate a failed solenoid.

Installation — Cummins QSB6.7 (also QSB4.5/QSB7)

Standard procedure for common-rail diesel injectors. Always follow the OEM service manual for torque values specific to your engine code.

Verify before ordering — check the OE nozzle code

Remove the connector cap from the existing injector. Check the OE nozzle code stamped on the solenoid cap. Do not rely on engine code alone. The primary SKU shown above fits Cummins QSB6.7 (also QSB4.5/QSB7) only — verify by nozzle + control valve code on the old injector body before ordering.

Depressurise the fuel system

With engine cold, disconnect the battery, remove the HP pump fuse, and crank the engine for 5 seconds. Never crack HP fuel lines while the rail is pressurised — rail pressure can exceed 1,600 bar on common-rail diesels.

Remove old injector — use the correct wrenches

HP fuel line nut: 17 mm flare nut wrench (rail side). Injector-side HP line nut: 13 mm. Banjo bolt (return pipe): 13 mm deep socket. Never use an impact wrench on the injector-side nut or hold-down bolt — shock loading cracks the solenoid body.

HP banjo bolt: 9–12 N·m · with new copper washers

Install new injector — torque hold-down bolt

Replace all seals: new copper washers on HP banjo connections, new O-rings on low-pressure return line. Reused seals are the #1 cause of post-install fuel leaks. Check injector protrusion with a dial gauge — shim if needed so the injector sits flush with the cylinder head.

Hold-down bolt: see OEM manual (verify against OEM service manual)

ECU coding — IMA / Trim coding is mandatory

Each cylinder's ECU requires cylinder-specific calibration coding after installing new injectors. Use Bosch ESI[tronic] 2.0, an OEM-level scanner (e.g. BMW INPA / ISTA, MAN MAN-cats, Bosch KTS 590), or quality aftermarket (Autel MaxiSys, Launch X431). Without coding: rough idle, black smoke, and P0201–P0206 fault codes. After coding, clear all DTCs and road-test under load.

IMA coding takes 10–20 minutes per vehicle — budget time accordingly

Post-install verification

Run leak-back test: with engine at idle, check return flow from each injector. Spec: < 50 mL/min per cylinder at 800 bar. Excessive flow = stuck valve seat. After a 30-minute test drive, let engine cool 15 minutes and re-torque the hold-down bolt — thermal cycling relaxes clamping force 5–10%.

HP line flare nut: 25-30 N m · banjo: 9–12 N·m