4378049 | Genuine Cummins® Diesel Exhaust Fluid Header Carrier About the Manufacturer – Mopar:

About the Manufacturer – Mopar:

“DPF Full” or “Regen Required” warnings

or adjust the sensor

Founded in 1994

Often a sign of sensor failure

4378049 | Genuine Cummins® Diesel Exhaust Fluid Header Carrier About the Manufacturer – Mopar:Description: A Diesel Exhaust Fluid (DEF) header 4378049 is a key component in a diesel vehicles emissions control system, specifically within the Selective Catalytic Reduction (SCR) system. The DEF header (also called a DEF tank head or DEF sender assembly) is the unit mounted on or inside the DEF tank. It monitors and manages the Diesel Exhaust Fluid thats injected into the exhaust to reduce harmful nitrogen oxide (NOx) emissions. Part Number: