5012175R91 | Genuine International® / Navistar® Diesel Exhaust Fluid (DEF) Header 25" for 10.6–32G

The 5012175R91 DEF Header is a tank-mounted component designed for compatible International® / Navistar® diesel emissions systems. This 25-inch header assembly is intended for specified Diesel Exhaust Fluid (DEF) tank configurations. Confirm the original part number and tank specifications before ordering to ensure compatibility.

PRODUCT INFORMATION

Part Number: 5012175R91
Brand: International® / Navistar®
Condition: Genuine OEM
Component: Diesel Exhaust Fluid (DEF) Header
Header Length: 25 inches
System: DEF / Selective Catalytic Reduction (SCR)
Tank Capacity: 10.6–32 gallons (verify exact fitment)

APPLICATIONS

Designed for compatible DEF tank configurations within the specified 10.6–32-gallon range. Exact compatibility depends on the vehicle model, model year, tank design, connector configuration, and original equipment part number.
Verify fitment using the vehicle VIN and the part number on the existing DEF header before purchase.

FUNCTION

The DEF header is installed in the DEF tank and works with the tank monitoring system. Depending on the configuration, the assembly may provide DEF level, temperature, and quality-related readings to support the vehicle's emissions control system.

COMMON SIGNS OF FAILURE

• Incorrect or inconsistent DEF level readings
• DEF level, quality, or temperature sensor fault codes
• Check Engine Light or emissions system warnings
• SCR system warning messages
• DEF monitoring or communication problems
• Emissions-related warnings or engine derate conditions

WHY REPLACE THE DEF HEADER?

A faulty DEF header can cause inaccurate tank readings, sensor-related diagnostic codes, and emissions system warnings. Replacing a confirmed defective unit with the correct compatible part can help restore reliable DEF monitoring and proper system operation.

FITMENT INFORMATION

Before ordering, verify part number 5012175R91, the 25-inch header length, tank capacity, electrical connector, and vehicle application against the original component or an OEM parts catalog. The stated 10.6–32-gallon range should be confirmed for this exact part number before publishing.

GENUINE INTERNATIONAL PART

Part Number: 5012175R91