04-31677-000 | Genuine Freightliner® Diesel Exhaust Fluid (DEF) Header 20" for 13/23G

Description and Purpose:

This Diesel Exhaust Fluid (DEF) Header, identified as Part number: 04-31677-000, is a new condition genuine Freightliner component designed for 13G and 23G DEF tank configurations. It integrates level sensing, suction, return, and coolant circulation functions into a single durable module. Built with SAE J2044 and NG12 port fittings, it ensures leak-free operation and precise fluid monitoring under heavy-duty working conditions. Cross reference: 0431677000

Why Replacement is Important:

A worn or malfunctioning DEF header can lead to inaccurate fluid readings, poor DEF circulation, and potential SCR system faults. Installing a new unit restores proper fluid management, safeguards emission compliance, and prevents unnecessary derating of the engine.

Impact on Vehicle Performance:

Supports accurate DEF level detection, maintains optimal fluid temperature, and ensures stable SCR performance for efficient exhaust aftertreatment operation.

Manufacturer Information: 

Freightliner® produces precision-engineered components built for endurance, ensuring reliable performance and long-lasting efficiency across heavy-duty truck applications.

Tags & Category: DEF Header, Diesel Exhaust Fluid Header, Freightliner DEF Tank Sensor, DEF Tank Header Assembly, DEF Level Sensor Module, DEF Tank Suction and Return Unit, 13G 23G DEF Header, SAE J2044 Fitting, NG12 Port Coolant Connection, SAE J2587 Tank Interface, 70 Micron In-Tank Filter, IP67 Rated DEF Sensor, Heavy Duty Truck Emissions System, DEF Temperature and Level Sensor, DEF Header Freightliner Cascadia

Warranty:

Parts Finder Q offers a 365-days warranty for all types of parts in any condition. The warranty applies exclusively to purchases made directly through our website (partsfinderq.com). Please note that purchases made through third-party platforms like eBay or Amazon are not covered by this warranty.