This is the Bosch 0444043144, a new DEF dosing module made by Bosch. It is the injector that meters diesel exhaust fluid into the exhaust stream ahead of the SCR catalyst. It crosses to Caterpillar 485-9752 and 424-4205 and it replaces the earlier Bosch 0444043115. Bosch builds this doser for more than one equipment maker, so order by the number on your old part, not by how it looks.

A failed dosing module usually shows up as a DEF dosing or SCR efficiency fault code, white urea crystals around the injector tip or flange, or DEF use that is far too low or too high. The same codes can come from a weak supply module, a plugged DEF line or poor fluid, so test the supply side before replacing the doser. This is a replacement part for the factory selective catalytic reduction (SCR) system.

Specifications

Fits / Applications

• Caterpillar engines and machines with a Bosch DEF dosing system that use Cat 485-9752 or 424-4205
• Order by the Bosch or Caterpillar number on the old doser. We do not list engine models for this part because we could not confirm them.

Keep the DEF line and electrical connector clean and capped while the doser is out, and use a new mounting gasket if your system has one. Clear the fault codes and run the system’s dosing test after fitting.

Part Numbers & Cross Reference

Bosch 0444043144  ·  Bosch (replaced) 0444043115  ·  Bosch 0444043040  ·  Bosch 0444043116  ·  Bosch 0444043145  ·  Caterpillar 485-9752  ·  Caterpillar 424-4205

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

What numbers does the Bosch 0444043144 replace?

It replaces Bosch 0444043115 and crosses to Bosch 0444043040, 0444043116 and 0444043145. The Caterpillar numbers are 485-9752 and 424-4205.

Is this a new or remanufactured doser?

It is a new dosing module made by Bosch, not a rebuild.

Which Caterpillar engines does it fit?

We list it by part number only, because we could not confirm an engine list. If your old doser carries Bosch 0444043144 or 0444043115, or Cat 485-9752 or 424-4205, this is the match. Call 530-668-0818 with your engine serial number if you are not sure.

Is this the same as the Bosch 0444043165 dosing module?

No. The 0444043165 is a different Bosch doser and the catalogs do not list the two as interchangeable. Match the number on your old part.

Related Parts

• Caterpillar C9 Fuel Injector | Alliant Power AP63941 Remanufactured (Cat 10R-4843)
• Caterpillar C7 HEUI Fuel Injector | Delphi EX634762 Remanufactured (Cat 10R-4762)
• Cat C4.4 & C6.6 and Perkins Common-Rail Fuel Injector | Alliant Power AP55001 Remanufactured (10R-7671)
• Kubota V3800 DEF Dosing Injector Kit for M5-111, M6-111, SVL95-2s & SVL97-2 | Genuine Kubota 1J517-97640

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.