Caterpillar DEF Doser Injector 2018-2024: OEM 451-0188

Precise DEF Metering for Cat Engines 

What Is It?

The OEM 451‑0188 DEF doser injector is an exact-fit CAT part for aftertreatment systems on Cat diesel engines from 2018 to 2024. It injects precise amounts of DEF (Diesel Exhaust Fluid) into the SCR chamber, supporting the neutralization of nitrogen oxides in the exhaust.

Why Choose OEM 451‑0188?

Built to Caterpillar’s original design specifications, this injector ensures accurate dosing working conditions and reliable integration with factory control modules, helping maintain emissions system function and avoiding SCR faults.

Key Benefits

✅ Factory-Matched Fit for Cat engines from 2018 through 2024
✅ Accurate DEF Dosing ensures consistent NOₓ reduction
✅ Plug‑and‑Play Compatibility with vehicle wiring and ECM
✅ Resilient Design handles high heat and DEF exposure
✅ Supports Emissions Standards by maintaining SCR reliability

Applications

This injector fits Cat on‑highway and off‑highway engines such as C7, C9, C11, C13, and C15 when equipped with SCR. Used in trucks, equipment, and generators operating in regulated NOₓ emission zones.

Installation Notes

Have a skilled technician install this unit. Before mounting, inspect DEF lines and verify they are clean and secure. After replacement, run a system test or forced regen via CAT diagnostics to confirm proper dosing and clear any fault codes.

Final Thoughts

The OEM 451‑0188 doser injector is essential for maintaining accurate DEF delivery in SCR systems. With reliable build quality and precise dosing, it helps sustain emissions integrity and system uptime across Cat engine platforms.