DEF Injector / Urea Injector (Doser) for Diesel Trucks
The urea injector — also called the DEF injector, doser injector or urea nozzle — is catalogued in this family by OE number. This family holds 32 catalogued entries.
Catalogued references include the injector set 0444023019 / 0444028008 / 0444023048 / 0444023008 / 0444023053, carried on the same catalogue entry as the further references 21574984 / 21738132 / 0444023051, the Cummins injector 2871878 / A028Y791 / 0444043008, and the Iveco injector 0444023058 / 5801730656 / 504374327 / 84247021. Because several of these numbers cross-reference each other, always quote the number from your old injector rather than a number from a forum post: the reply will confirm which catalogue entry covers it. For the family walked entry by entry, read the DEF injector family guide, and compare terminology on the DEF injector vs doser injector page.
Order by OE number, not by guesswork
Quote the number stamped on the injector you removed — nothing else identifies this part reliably, because one injector serves several applications under a stack of cross-references: the entry headed 0444023019 also carries 0444028008, 0444023048, 0444023008 and 0444023053. Your number is read against the entry that carries it, and the reply states which entry covers it before any price is set. Add the engine the injector serves; where two entries could claim a number, the engine separates them. If the old injector's number is illegible, send the engine type and a photograph of the unit as supporting evidence — the photo narrows the family, but the confirmation still waits for a number that can be checked.
Fitment confirmation checklist
The inquiry should carry four things: the vehicle make and model, the engine type, the OE number from the old part, and any unusual connector or mounting detail. The engine matters more than it looks — one truck model can leave the factory with several engine options and several urea injector specifications. Confirmation rests on each entry's listed applications; if your exact model is not among them, the reply says so instead of stretching the fitment. Distributors working through a stock list can send the numbers as a spreadsheet and get a matched or not-matched answer line by line.
Packaging, stock and dispatch
The injector box is chosen per consignment: OEMEMBER or UAP branded boxes where the range is resold under its own identity, blue or white neutral boxes where a distributor's own label goes on the shelf. More than 100 catalogued items in this catalogue can be dispatched within 3 days, and more than 2,700 items within 15 days — the availability line that applies to your entry is confirmed with the quote. Warranty terms are settled in the quotation before payment, and certificates are available upon request with the inquiry. Keep the confirmed OE list from the first order and quote it back on any repeat order.
Frequently asked questions
Is a doser injector different from a DEF injector?
No. On this site, doser, DEF injector, urea injector and urea nozzle are used as names for the same component, and all of them land on this 32-entry family. The comparison page on this site walks through the naming in detail; the OE number is what the confirmation is made against, whichever name you arrive with.
Can a clogged injector be cleaned instead of replaced?
The catalogue entry for an injector records its references and applications; it does not record whether a given unit can be cleaned, and this page does not decide that either. Send the OE number and the engine type, and include the fault text from the vehicle: the reply confirms the entry your number lands on, and whether cleaning or replacement is the right step for your unit follows the maker's service information for that engine.
Which vehicles do these injectors fit?
Catalogued applications include Cummins, Iveco and Volvo engines, among others; the family's deep-checked entries include the 0444023019 reference set, the Cummins injector 2871878 and the Iveco injector 0444023058. Send your OE number and engine type and fitment will be confirmed against the catalogue entry.
Replacing a doser injector? Send its OE number and engine type.
Send the OE number, vehicle model and engine — fitment is confirmed against the catalogue entry before any quotation. Samples and mixed-OE orders are welcome.