0444042032 | Genuine Bosch® Diesel Exhaust Fluid Pump 2.2 12V, 5 Outlet

A Diesel Exhaust Fluid Pump 0444042032 is a component of a diesel engine’s Selective Catalytic Reduction (SCR) system, which is used to reduce nitrogen oxide (NOx) emissions from the exhaust. It’s sometimes also called a urea dosing module because it handles Diesel Exhaust Fluid (DEF), which is a urea solution. Denoxtronic 2.2 Doser Fluid Supply Module 12V, 5 Outlet For Volvo D11, D13, Mack MP7, MP8, Cat C9.3, C13, C15, Hino 268, 268A, 338

General Specifications

Purpose & Function

• Reduce NOx Emissions

  • Injects the right amount of DEF into the exhaust, which reacts in the SCR (Selective Catalytic Reduction) catalyst to convert harmful NOx into harmless nitrogen (N₂) and water (H₂O).

• Meet Emission Regulations

  • Ensures compliance with strict standards such as Euro 6, EPA Tier 4 Final, and other regional diesel emission laws.

• Protect the Environment and Health

  • Reduces smog-forming NOx pollutants, protecting air quality and reducing respiratory hazards.

• Support Engine Efficiency

  • By controlling NOx chemically instead of mechanically limiting combustion, the engine can operate efficiently without sacrificing power.

• Enable Precise DEF Usage

  • The module ensures exact dosing, preventing overuse of DEF (wasteful) or underuse (ineffective emission reduction).

Signs of Bad Diesel Exhaust Fluid Pump

• DEF/AdBlue Warning Light

  • Dashboard lights may indicate low DEF flow, system malfunction, or dosing errors.

• Check Engine Light or SCR Fault Codes

  • The ECU may detect improper dosing and trigger engine fault codes.

• Reduced Engine Power (Limp Mode)

  • Many modern diesel engines limit power to protect the engine when the SCR system is not functioning correctly.

• Increased NOx Emissions / Failed Emissions Test

  • A malfunctioning doser module can prevent proper NOx reduction, causing failed emissions inspections.

• Frequent or Failed SCR Regeneration

  • If DEF is not being injected correctly, the SCR catalyst cannot reduce NOx efficiently, leading to repeated regeneration attempts or failure.

• Unusual DEF Usage

  • Overuse (leak or over-injection) or underuse (blockage or pump failure) of DEF can indicate a problem with the module.

• Strange Noises from Module

  • A failing pump inside the doser module may produce unusual buzzing or grinding sounds.

About Bosch

  Bosch is a global engineering and technology company based in Germany, best known for its high-quality automotive components, industrial technology, consumer goods, and building technology. Founded in 1886 by Robert Bosch, the brand is recognized for innovation, precision engineering, and reliability.
  In the automotive sector, Bosch is a leading supplier of systems such as fuel injection, braking, electrical drives, sensors, and emissions control. Their components are widely used by major vehicle manufacturers worldwide.