Freightliner Detroit Diesel DEF Header | 04-33656-000
Aftermarket Freightliner Detroit Diesel DEF header replaces OEM 04-33656-000. No core required. Built to OEM standards for durability and performance. Backed by full manufacturer warranty.
Freightliner Detroit Diesel DEF Header | 04-33656-000
The aftermarket DEF Header for Freightliner Detroit Diesel replaces OEM part 04-33656-000 and is engineered to deliver long-term reliability and precise DEF system performance. This direct-fit replacement is built to OEM specifications, ensuring accurate fluid level and temperature readings that are critical for maintaining SCR efficiency and emissions compliance.
Manufactured from high-quality, DEF-compatible materials, the unit is resistant to crystallization, corrosion, and failure in harsh operating environments. Whether you’re replacing a faulty sensor or addressing DEF system faults, this header restores functionality and minimizes costly downtime. With no core required, installation is simple and cost-effective—ideal for fleet operators, technicians, and owner-operators seeking dependable aftermarket value.
Designed specifically for Freightliner models powered by Detroit Diesel engines, this DEF header offers a secure, leak-resistant seal and integrates seamlessly with the vehicle’s emissions system. Backed by a full manufacturer warranty and supported with fast nationwide shipping, it’s a trusted choice for keeping your diesel vehicle compliant and running efficiently.
Avoid expensive OEM replacements without compromising quality. Upgrade your DEF system with this proven aftermarket solution and stay on the road with confidence.
DEF Header Features:
Designed For:
Manufacturer Warranty
DuraWRX provides a manufacturer's warranty on its DEF-related products for up to 2 years/40,000 miles/1,200 hours (whichever occurs first). This warranty covers any defects in materials or workmanship. To be eligible for a claim, the end user must register their product purchase on the DuraWRX site. To file a claim, customers must contact DuraWRX to receive a return shipping label. Once the product is returned and the claim is approved, DuraWRX will issue either a refund or a credit.
DEF Header Specs:
Please confirm your OEM or Aftermarket number matches before ordering.
04-33656-000
0433656000
ASPFL-2327
ASPFL2327
Shipping & Returns
Why Buy From American Radiator?
Trust American Radiator, your reliable source for quality cooling solutions since 2001. With roots in the industry dating back to the 1970s, our team brings decades of experience delivering high-performance radiators, charge air coolers, and DPF systems at competitive prices.
We work directly with trusted domestic and international manufacturers that supply OEM-grade components, ensuring every product meets or exceeds original equipment standards. Whether you need a heavy-duty truck radiator or a replacement for your DEF Header, we’re committed to providing durable, cost-effective solutions that perform.
Have questions? Contact our experienced inside sales team at 888-483-5763 for expert guidance and fast, friendly support.
| Part Number | SKU | 256000 |
|---|---|
| OEM | Aftermarket Numbers | 04-33656-000 0433656000 ASPFL-2327 ASPFL2327 |