Keep your diesel's aftertreatment dosing exactly where it should with the Standard Ignition Diesel Exhaust Fluid (DEF) Injection Nozzle DFI1. It installs as a direct-fit replacement for the 2011-2016 Ford F-250, F-350, F-450 and F-550 Super Duty (V8-6.7L) and the 2015-2018 Ford Transit-150, Transit-250, Transit-350 and Transit-350 HD (L5-3.2L).
This nozzle is the metering point of the selective catalytic reduction (SCR) system: it sprays diesel exhaust fluid into the exhaust stream ahead of the SCR catalyst, where the DEF helps convert NOx emissions into nitrogen and water.
- Job it does: delivers a controlled charge of DEF into the exhaust, supporting normal aftertreatment operation.
- Direct-fit design: intended to replace the original nozzle on the listed applications.
- Sold individually: one nozzle per application (qty 1).
Signs the original DEF injector may need replacing include a DEF/emissions warning light, reduced engine power or a countdown/derate warning, and DEF-system fault codes. If a clogged or failed injection nozzle is the cause, this part replaces it — diagnose the fault before ordering, since these symptoms can have other causes.
Interchange: Manufacturer part number DFI1.
