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Cummins  |  SKU: 0-444-043-031

0-444-043-031 | Genuine Cummins® Def Doser Injector Urea

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Description:
A DEF Doser Injector (also called a Urea Injector, DEF Injector, or SCR Doser) 0-444-043-031 is a component in modern diesel vehicles that sprays DEF (Diesel Exhaust Fluid) into the exhaust system to reduce emissions.

Part Number: 0-444-043-031, 0444043031
Condition: New
Manufacture/Brand: Cummins

Fits 0-444-043-031 For Cummins Engines EPA13 15 liter ISX/QSX

Purpose of using 0-444-043-031:

 

1. Sprays DEF into the exhaust stream

It injects a fine mist of DEF (32.5% urea + 67.5% deionized water) into the hot exhaust pipe.

2. Helps reduce NOx emissions

When DEF is sprayed into hot exhaust:

  • DEF converts into ammonia

  • The ammonia reacts in the SCR catalyst

  • Harmful NOx (nitrogen oxides) are converted into nitrogen + water

This is how diesel vehicles meet emissions laws.

3. Controlled by the ECM/PCM

The engine computer decides:

  • When to spray

  • How much to spray

  • Spray timing based on exhaust temperature & load


Signs of a Bad Def Doser Injector Urea 0-444-043-031:

A failing doser can cause:

  • DEF system warning light

  • Check Engine Light

  • Low or no NOx reduction

  • Crystallized DEF buildup at the injector

  • Poor fuel economy

  • Reduced engine power (“limp mode”)

  • Smell of ammonia in exhaust

  • DEF consumption too high or too low

Common trouble codes:

  • P20E8 (low DEF pressure)

  • P204F (SCR system)

  • P20EE (NOx efficiency below threshold)

  • P2033/P2032 (temperature issues affecting DEF spray)

 

About the Manufacturer – Cummins:

Cummins is a leading American manufacturer of diesel and natural gas engines, as well as power generation systems and emissions solutions. Founded in 1919 and headquartered in Columbus, Indiana, Cummins is known globally for its durable, high-performance engines used in trucks, buses, construction equipment, agriculture, and power systems.

The brand is widely respected for its innovation in clean diesel technology, including aftertreatment systems, turbochargers, and advanced electronics that help reduce emissions while maximizing engine efficiency and reliability.

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