DEF Doser

Genuine OEM DEF Doser Injectors

A failing DEF doser injector can disrupt fluid delivery to the SCR catalyst, trigger emissions fault codes, and force the engine into a derate. Because the doser must meter and inject diesel exhaust fluid at precise intervals and quantities, a wrong or generic replacement often leads to over- or under-dosing, catalyst damage, or a fault code that won't clear. That's why every DEF doser in this collection is genuine OEM, matched to the manufacturer's original part number.

What's in this category

This collection covers genuine OEM DEF doser components, including:

• DEF doser injectors — precision injectors that meter and deliver diesel exhaust fluid into the exhaust stream for SCR system operation
• DEF doser injector SCR modules — integrated assemblies combining the doser injector and SCR control module

Brands & engines we cover

This collection includes genuine OEM DEF doser injectors for Paccar and Cummins engines (B6.7, L9, X12, X15) — and more, with new listings added regularly.

Why order your DEF doser here

• Genuine OEM only — every injector is matched to the manufacturer's original part number, not a generic equivalent
• Built for accurate fitment — listings include the exact OEM number and engine application so you can verify the right part before you buy
• Fast turnaround — ships quickly to restore emissions compliance and keep your engine out of derate

FAQ

Browse the full selection below, or search by OEM part number to find your exact match.