Bosch 0445124019 is a new, genuine Bosch common-rail injector for the Cummins QSB6.7 industrial engine in its Tier 4 (EU Stage IV) form. It is the Bosch part behind Cummins 5289266. Bosch’s remanufactured versions of this injector carry the numbers 0986435721 and 0986435722. Sold as one injector; the QSB6.7 uses six.

Replace when a cylinder shows hard starting, rough running, smoke or low power traced to the injector. Tier 4 common-rail injectors do not tolerate dirt or water, so replace the filters and clean the fuel system before a new injector goes in. Earlier common-rail QSB engines use different injectors, such as Bosch 0445120231 (Cummins 5263262), so match the number on the old injector.

Specifications

Fits / Applications

• Cummins QSB6.7 industrial engines, Tier 4 / EU Stage IV versions

Install with a new nozzle washer and O-ring and a clean, undamaged high-pressure connector (feed) tube. Replace the fuel filters and flush any contaminated fuel before start-up. Record the code printed on the injector; if the engine’s ECM uses injector trim data, enter it with Cummins INSITE or an equivalent service tool.

Part Numbers & Cross Reference

Cummins 5289266  ·  Cummins (suffix versions) 5289266NX, 5289266PX, 5289266RX  ·  Bosch reman 0986435721  ·  Bosch reman 0986435722

Cross-reference numbers can change with engine serial, build year and emissions tier, so treat this list as a starting point. Send us your engine serial number before you order and we will help you confirm the exact match against your build. That check is free and takes a few minutes.

Frequently Asked Questions

Is Bosch 0445124019 the same injector as Cummins 5289266?

Yes. It is the Bosch part behind Cummins 5289266. Bosch’s remanufactured versions of this injector carry the numbers 0986435721 and 0986435722.

Will 0445124019 fit an earlier QSB6.7 that is not Tier 4?

No. It is for the QSB6.7 industrial engine in its Tier 4 (EU Stage IV) form. Earlier common-rail QSB engines use different injectors, such as Bosch 0445120231 (Cummins 5263262), so match the number on the old injector or call 530-668-0818 with the ESN and CPL.

How many 0445124019 injectors does a QSB6.7 need, and is there a core?

It is sold as one injector and the QSB6.7 uses six. Each is new and genuine Bosch, sold outright with no core charge and nothing to send back.

Does 0445124019 need a code entered after it goes in?

Record the code printed on the injector. If the engine’s ECM uses injector trim data, enter it with Cummins INSITE or an equivalent service tool.

Related Parts

• Cummins QSB4.5 & QSB6.7 Tier 4 CP4.2 High-Pressure Fuel Pump | Bosch 0445020609 New
• Cummins QSB4.5, QSB5.9 & QSB6.7 Common-Rail Fuel Injector | Bosch 0445120231 New (Cummins 5263262)
• Cummins ISB & QSB 6.7L Medium-Duty Injector | 0986435697 | Bosch Authorized Remanufactured by VFI

Why Buy From Valley Fuel Injection

We are a diesel fuel-injection and turbocharger shop in Woodland, CA, rebuilding pumps, injectors and turbos on our own benches since 1993, not a drop-ship storefront. When you call, you talk to the people who test these units. Send us your engine serial, VIN or build date before you order and we will help you confirm fitment, so the right part arrives the first time.

Not sure the injectors are the problem? We test and diagnose in-house before you buy. See our common rail injector testing and rebuild service.