A0001404039 | Genuine Detroit Diesel® DEF Metering Unit

Part Number: A0001404039 
Condition: New
Manufacture/Brand: Detroit Diesel
Related Part Numbers: EA0001404039, EA0001405139, A0001405139

Description:
A DEF metering unit — also known as a DEF doser, urea metering unit, or DEF dosing module — is a key component of the Selective Catalytic Reduction (SCR) emissions system on diesel-powered vehicles. It precisely controls the flow of Diesel Exhaust Fluid (DEF) into the exhaust stream. DEF Metering Unit, Doser Pump, Emission Metering Module 12V, UL2 type, 2014-2021

Fits For 
Detroit Diesel / Daimler (Freightliner / Western Star etc.) engine / chassis setups
Engines:
Detroit Diesel DD13, DD15, DD15

Purpose:

Signs of a Bad DEF Metering Unit

About the Manufacturer – Detroit Diesel:

Detroit Diesel is a leading American manufacturer of heavy-duty diesel engines, transmissions, and aftertreatment systems, primarily for the commercial trucking industry. Founded in 1938 and now a subsidiary of Daimler Truck North America, Detroit is best known for its DD Series engines — including the DD13, DD15, and DD16 — which power Freightliner and Western Star trucks.

Detroit also produces advanced technologies such as Detroit™ Axles, Detroit™ Connect telematics, and integrated powertrains, offering fleet operators improved fuel efficiency, uptime, and diagnostics. The company is headquartered in Detroit, Michigan, and continues to play a central role in modernizing emissions systems and performance standards in heavy-duty transportation.