Caterpillar DEF Doser Injector 2018-2024: OEM 398-5386

Precision Urea Control for Cat SCR Systems

What Is It?

The OEM 398‑5386 is a direct-fit dosing injector designed for Caterpillar SCR aftertreatment systems from 2018 to 2024. Installed within the DEF (Diesel Exhaust Fluid) delivery system, it accurately meters urea into the exhaust to support NOₓ reduction.

Why Choose OEM 398‑5386?

Built to original Caterpillar/Bosch specifications, this injector offers precise spray pattern and dosing flow, ensuring proper integration with factory electronics. It prevents service faults and maintains SCR efficiency

Key Benefits

✅ Exact OEM Fit for Cat 2018–2024 diesel engines
✅ Accurate Urea Metering ensures optimal DEF dosing
✅ Durable Bosch Construction tolerates high-temp and chemical exposure 
✅ Vehicle-Wired Plug‑and‑Play — no modifications needed
✅ Supports Emissions Standards by maintaining SCR system reliability

Applications

This injector is used in medium- and heavy-duty Cat on‑highway and off‑highway engines (e.g., C13, C15, C18). It’s ideal for construction, mining, and agricultural equipment operating in regulated NOₓ environments 

Installation Notes

Install using a certified technician. Ensure DEF lines and connections are debris-free before mounting. After install, run a system test or regen cycle with CAT diagnostic tools to confirm dosing operation and clear any fault codes.

Final Thoughts

The OEM 398‑5386 DEF doser injector is essential for maintaining SCR functionality and emissions compliance in Caterpillar engines. With OEM-level build, accurate dosing, and Bosch quality standards, it ensures long-term system working conditions.