0445110478 — Technical Research
Bosch solenoid common-rail injector for BMW N47 2.0d and N57 3.0d engines. Part of the Bosch CRI family shared across BMW supersessions (e.g. 0445110382/0445110479/0445110617). BMW injector adjustment (IMA) values should be programmed after fitting. Verify the exact BMW number by VIN as N47/N57 use several injector revisions. Key symptoms: Rough idle / hunting revs; Hard starting; Loss of power / limp mode; Fluctuating or low rail pressure codes. Common failure modes: Excessive back-leakage / leak-off; Nozzle coking / carbon at injector well; Worn nozzle needle/seat.
Bosch 0445110478 BMW N47 / N57 2.0d & 3.0d Common Rail Injector
Bosch solenoid common-rail injector for BMW N47 2.0d and N57 3.0d engines. Part of the Bosch CRI family shared across BMW supersessions (e.g. 0445110382/0445110479/0445110617). BMW injector adjustment (IMA) values should be programmed after fitting. Verify the exact BMW number by VIN as N47/N57 use several injector revisions. Key symptoms: Rough idle / hunting revs; Hard starting; Loss of power / limp mode; Fluctuating or low rail pressure codes. Common failure modes: Excessive back-leakage / leak-off; Nozzle coking / carbon at injector well; Worn nozzle needle/seat.
A leaking or out-of-balance injector under/over-fuels its cylinder, causing an unstable idle.
Injector back-leakage and worn glow components lower cranking rail pressure on N47/N57.
Rail-pressure or injector-correction faults trigger an ECU derate.
Excessive injector leak-off prevents the rail holding target pressure.
Poor atomisation from a worn or coked nozzle.
A single failing injector produces a stumble on its cylinder.
- MisdiagnosisN47/N57 rough idle and hunting are frequently caused by carbon at the injector wells or glow-plug faults - inspect and run a leak-off test before condemning injectors.
- InstallationProgramme the BMW injector adjustment (IMA) values after fitting so the ECU fuels each cylinder accurately.
- WarningIf the high-pressure pump has failed, metal debris may have contaminated the rail and injectors - inspect the whole fuel system before fitting new injectors.
- InstallationRenew the copper sealing washer, clean the bore and torque the clamp to spec to prevent combustion blow-by.
- TestingTest on a Bosch-capable common-rail bench; read live injector correction values to identify the weak cylinder before removal.
What is Bosch injector 0445110478?+
A Bosch solenoid common-rail diesel injector for BMW N47 2.0d and N57 3.0d engines, part of a family shared across several BMW supersessions.
Which BMWs use 0445110478?+
N47/N57-engined 1, 3, 5, 7 Series, X3 and X5 (2.0d and 3.0d) built roughly 2009-2018.
Is it solenoid or piezo?+
It is a Bosch solenoid common-rail injector.
What BMW OE numbers cross to 0445110478?+
Family BMW numbers include 13537810702, 13537810703, 13538572474 and 13538576298 - verify the exact number by VIN.
Do I need to code the injector after fitting?+
Yes - programme the BMW injector adjustment (IMA) values so the ECU fuels each cylinder correctly.
What are the symptoms of a failing N47/N57 injector?+
Rough idle/hunting, hard starting, limp mode, low or fluctuating rail pressure, black smoke and cylinder misfire.
Why does my N47 hunt at idle?+
Carbon at the injector wells, a leaking injector or glow-plug faults are common causes - run a leak-off test and inspect before replacing parts.
Can a failed high-pressure pump damage these injectors?+
Yes - HPFP break-up can send metal debris through the rail and injectors, so inspect the whole fuel system if the pump has failed.
Should I replace one or all injectors?+
Diagnose each with a leak-off test and live correction values; on high-mileage engines failures often cluster, so check all.
Can I test 0445110478 on any bench?+
Use a Bosch-capable common-rail bench so the N47/N57 test plan and leak-off targets are correct.
Why renew the copper washer?+
It is a one-use crush seal; reusing it risks combustion blow-by and carbon build-up around the injector.
Does a remanufactured 0445110478 perform like new?+
A properly remanufactured injector is bench-tested and recalibrated to the Bosch plan to meet original delivery and leak-off specs.