5578983 | Genuine OEM Cummins DEF Doser Injector

The 5578983 Genuine OEM Cummins DEF Doser Injector is a component of the diesel exhaust fluid (DEF) aftertreatment system. It is designed to deliver DEF into the exhaust stream to support selective catalytic reduction (SCR) and emissions control. Verify the part number and application before purchasing to ensure compatibility with your vehicle.

PRODUCT INFORMATION

Part Number: 5578983
Brand: Cummins
Condition: New
Component: DEF Doser Injector
Fuel Type: Diesel
Engine Applications: Not confirmed
Other Specifications: Diesel exhaust fluid injection component for the aftertreatment system.

APPLICATIONS

The 5578983 DEF Doser Injector is intended for compatible Cummins aftertreatment systems. Specific engine models, vehicle applications, and configurations have not been confirmed. Check the original part number and vehicle specifications before ordering.

FUNCTION

The DEF Doser Injector delivers diesel exhaust fluid into the exhaust stream, where it supports the selective catalytic reduction (SCR) system. This process helps reduce nitrogen oxide (NOx) emissions. Proper DEF dosing is essential for the aftertreatment system to function as designed.

A worn, damaged, or failing DEF Doser Injector may cause symptoms such as:

• DEF dosing or injection problems
• SCR system performance issues
• Check engine light or aftertreatment warning lights
• Increased NOx emissions
• DEF system fault codes
• Emissions system performance warnings

WHY REPLACE A DEF DOSER INJECTOR?

A faulty DEF Doser Injector can interfere with proper fluid delivery and emissions control. Replacing a defective injector with the correct compatible part can help restore proper DEF dosing and support the SCR system's intended operation. Additional diagnostics may be necessary to identify related aftertreatment system faults.

FITMENT INFORMATION

Before purchasing the 5578983 DEF Doser Injector, verify the Part Number, VIN, vehicle model, engine, and aftertreatment system configuration. Compatibility may vary by vehicle and engine application. Do not rely on appearance alone when selecting a replacement part.

If you are unsure whether this part is correct for your vehicle, please contact us with your VIN and original part number. We are happy to help verify compatibility before purchase.

GENUINE CUMMINS PART

Part Number: 5578983