Description:
A Diesel Exhaust Fluid Pump 0-444-042-27E 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

Part Number: 0-444-042-27E, 044404227E
Condition: New
Manufacture/Brand: Bosch

Fits  0-444-042-27E For Volvo D11, D13, Mack MP7, MP8, Trucks Volvo VNL, Volvo VNM, Volvo VNR, Mack Pinnacle, Mack Anthem, Mack Granite, Caterpillar C9.3, C13, C15, Hino 268, 268A, 338, Hino J-series diesel engines

Purpose of using 0-444-042-27E:

  • 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 0-444-042-27E:

  • 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.