This is the genuine Bosch 0444043033, a new DEF dosing module for Cummins ISB, ISC, ISL and ISX engines with an SCR system. Catalogs list it for the EPA 2010 and EPA 2013 emissions years. It is the doser injector that sits in the exhaust ahead of the SCR catalyst and sprays diesel exhaust fluid into the stream. It replaces Cummins 2888173, also shown as A030P707, and Bosch is the original maker of this doser for Cummins.

Dosers fail by plugging with dried DEF crystals, by leaking at the tip or by an open or shorted coil. The signs are a low SCR efficiency code, a DEF dosing fault, white crystal build-up around the doser, or a derate warning. Before you replace it, check DEF quality, the supply module pressure and the heated lines, since a weak pump or a blocked line throws the same codes. This is a replacement part for the factory system only.

Specifications

Fits / Applications

• Cummins ISB 6.7L with SCR
• Cummins ISC 8.3L with SCR
• Cummins ISL 8.9L with SCR
• Cummins ISX with SCR, including the ISX15
• EPA 2010 and EPA 2013 emissions years
• Replaces Cummins 2888173 and A030P707. Match the number on the old doser.
• Catalogs also list it as an interchange for the Paccar doser 1819798PE. Call us to confirm before you order for a Paccar engine.
• Replacement part for the factory SCR system only

Fit a new mounting gasket, keep the tip clean and do not touch the spray holes. After fitting, run the DEF doser override or purge test with a scan tool and check the line connection for leaks. Clear the SCR fault codes and confirm dosing on a road test.

Part Numbers & Cross Reference

Bosch 0444043033  ·  Cummins 2888173  ·  Cummins 2888173NX  ·  Cummins 2888173RX  ·  Cummins A030P707  ·  Cummins (catalog interchange) 2888174  ·  Cummins (catalog interchange) 2888112  ·  Bosch sister doser (catalog interchange) 0444043031  ·  Bosch sister doser (catalog interchange) 0444043018  ·  Paccar (catalog interchange) 1819798PE

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 and we will confirm the exact match against your build before anything ships. That check is free and takes a few minutes.

Frequently Asked Questions

Which engines does the Bosch 0444043033 doser fit?

Cummins ISB, ISC, ISL and ISX engines with an SCR system that use Cummins doser 2888173. Catalogs list it for the EPA 2010 and EPA 2013 emissions years. Match the number on your old doser, or call 530-668-0818 with the engine serial number.

What numbers does the 0444043033 replace?

Cummins 2888173, also shown as A030P707, 2888173NX and 2888173RX. Catalogs also list it as an interchange for Cummins 2888174 and 2888112, the sister dosers in the same Bosch family. If your old doser has one of those two numbers, call us to confirm before you order.

Is this a new Bosch part or a remanufactured one?

It is a new genuine Bosch dosing module. Bosch is the original maker of this doser for Cummins.

Is this the DEF pump?

No. This is the dosing module, the injector at the exhaust. The DEF pump is the supply module, and it is a separate part.

Related Parts

• Cummins ISC 8.3L C Series Fuel Injector (Cummins 3948523, 3944211) | Bosch 0432191391 New
• Cummins ISB 5.9L 24-Valve Midrange Fuel Injector (175 hp) | Bosch 0432193646 New (Cummins 3944205)
• Cummins ISX15 & QSX15 EPA10 XPI Fuel Injector (5579415, 2894920) | Alliant Power AP55102 Remanufactured
• Cummins ISC & ISL 8.9L HE300VG Turbo Actuator Kit | Holset 6382091HX Remanufactured

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. We verify fitment against your engine serial, VIN or build date before anything ships, so the right part arrives the first time.